Bular

"Centuries of Trollhunters, and I would have killed two in almost as many days."

- Bular to Jim and Toby in "Becoming: Part 2" Bular the Vicious was the son of Gunmar and an antagonist in Part One of Trollhunters.

Official Description
"Impulsive and explosive, Bular is the last of his tribe, hiding in the shadows of the human world. His warlord father Gunmar has been imprisoned within the Darklands for centuries. It kills Bular that he must take orders from Strickler, a lowly, second-class Changeling. He wants nothing more than to destroy the Trollhunter and free Gunmar and his army, proving his worth to his estranged father."

Backstory
During the Battle of Killahead Bridge, Deya the Deliverer exiled Bular's father, Gunmar, and the rest of his army into the Darklands. Bular managed to avoid exile and remained roaming the human world, trying to steal the Amulet of Daylight and rebuild the Killahead Bridge to free his father.

Hunting the Amulet
Bular first appears in "Becoming: Part 1" when he duels Kanjigar at sunrise under a bridge in Arcadia. Although he manages to disarm the veteran Trollhunter and wound him by forcing him into the sun's rays, his plans to acquire the amulet are thwarted when Kanjigar sacrifices himself and leaves the amulet in sunlight where it cannot be reached.

Encountering Jim
Following Jim Lake's successful audition for the part of Romeo, Bular ambushes Jim and Toby on the streets of Arcadia Oaks. The Gumm-Gumm attempts to smash the pair and hurls a truck at them, but they evade him on their bicycles by squeezing behind a building where he cannot fit. Bular then attacks the two after they meet up with Blinky and AAARRRGGHH!!!, chasing the foursome back to the canal where Kanjigar fell. Unfortunately for the son of Gunmar, Blinky and AAARRRGGHH!!! managed to secret the duo into Heartstone Trollmarket, where he could not follow. After his failure to retrieve the amulet, Bular was sharply rebuked by Stricklander, who had come to Jim's house.

Bular desired to break open the Lake house and kill Jim on the spot, to which Stricklander argued would draw unnecessary attention and risk exposing their agenda to both humans and trolls. Grudgingly, Bular accepted Stricklander's advice to adapt and wait for another opportunity, though the Changeling was forced to push Bular out of the way before Jim could spot them.

Building the Killahead Bridge
Following the escape of Jim with the Amulet, Bular and Strickler changed tactics and began building the Killahead Bridge so that it would be ready when the Amulet was acquired. Bular was annoyed with the slow pace of the work and suspicious of Strickler's plan to build it in a human museum, but praised the bridge as the dawn of "The Age of Gunmar." As more pieces arrived, Bular secured the construction site, chasing down and presumably eating a hapless security guard.

Bular later attempted to execute Nomura for allowing Jim and Toby to discover the Killhead Bridge. However, he relented when she presented him with a Fetch. Figuring his father's army will require one more Changeling if they fall short, Bular spared her life so as to spite Strickler.

After disassembling the bridge before Jim could show it to Vendel and reassembled it back in the museum, Strickler informed Bular of Gladys Groe's demise. The Gumm-Gumm prince offhandedly dismissed her as expendable, given that she already got the stones from Madagascar, and disregarded Strickler's advice to at least care for those in his employ, stating that once his father is free, he'll destroy the Trollhunter. Suddenly, a stone with trollish inscription appeared through the Fetch, confirming that Enrique Nuñez had been chosen to be swapped with his Changeling counterpart.

On Jim's birthday, an impatient Bular refused to wait for the Trollhunter to stumble onto the bridge again and thus decided to summon a Stalkling. Strickler subsequently learned of this undertaking and confronted Bular at a mine, reminding that this violated their agreement to avoid killing Jim least it caused unwanted scrutiny. Bular reasoned that the Stalkling would wait until Jim was alone to strike. However, he underestimated Jim once again, who managed to kill the Stalkling.

Eventually, Otto Scaarbach brought the Eyestone, allowing Bular and his henchmen to talk with Gunmar. Bular interrupted Strickler's attempt to stroke Gunmar's ego and told his father of the new human Trollhunter and how Strickler prevented him from killing Jim and taking the amulet from him. They got into a brief argument before an irritated Gunmar interrupted them. The Gumm-Gumm king acknowledged that Strickler was correct to spare Jim, least their enemies discover their plan. Furthermore, he declared that Bular shall be giving the orders, to the latter's smug delight.

Bular then spoke privately with his father, who noted that Strickler had grown soft. Bular explained that in his human guise, Strickler was Jim's teacher and thus he suspected the Changeling possessed affection for the child. Thus, Gunmar suggested Bular test Stricker's loyalty.

Opportunity came knocking when Jim ventured into the sewers, challenging Bular to a duel, which the Gumm-Gumm prince was happy to oblige. Spotting a Grit-Shaka around his neck, Bular immediately guessed why the Trollhunter was so eager to challenge him. Due to the Gumm-Gumm totem negatively influencing him, Jim proved arrogant in the ensuing duel before Bular crushed the totem under his heel. As Jim cowered in fear, Bular attempted to pounce at him, only for Toby to pull off a manhole cover up top, exposing sunlight that forced Bular back. As he stalked around Jim, Blinky and AAARRRGGHH!!! appeared to help him only for a goblin to kick off another manhole cover, keeping them at bay. Bular then subtly revealed Stricker's identity as a Changeling by calling Jim, "Young Atlas", which was Strickler's nickname for him. Jim then escaped, which was just what Bular had planned.

Strickler was less than happy to learn of what Bular did until Gunmar stated it was all to force a confrontation, in which Strickler would kill Jim and take the amulet. Being sporting, Bular told Strickler he was to kill Jim if he couldn't get the boy to hand over the amulet.

The Battle for the Killahead Bridge
Strickler managed to succeed in his task, managing to swap the amulet for a fake. Desiring the honor for himself, Bular then took the amulet and inserted into the bridge only for it to fail. Strickler took a closer look at the inscription on the amulet and told Bular that only the Trollhunter can open the bridge, so he sent Nomura after Jim. However, Jim was able to summon the amulet back him while fighting goblins and Nomura was unable to capture him.

Fortuitously, NotEnrique delivered Blinky right into Bular's waiting arms and thus the villains sought to use him as a hostage to force Jim to open the bridge. But just before Jim could insert the amulet, everyone hears a beeping sound and Nomura announces that the Trollhunter was wearing a Chubby Tracker, which was the same device that led Jim to the bridge the first time. Toby, Draal and AAARRRGGHH!!! then show up and a battle ensues. Bular briefly clashed swords with Jim before grappling with Draal, who identified himself as Kanjigar's son. Bular nearly overpowered Draal before engaging AAARRRGGHH!!! and taunted his father's former general, calling him a pet.

At the height of the battle, Strickler manages to open the bridge, at which Bular heard Gunmar calling out to him. But he soon disengaged in an attempt to stop Draal from pulling out the amulet, resulting in the bridge being destroyed. Bular emerged from the rubble and attempted to call out to his father before pursuing the Trollhunters through the sewers.

Bular confronts Jim in their final battle under the same bridge where he fought Kanjigar. They traded blows for a while before Jim slipped beneath Bular's blindspot. Seeking to draw his foe out, Bular guessed that Jim wanted Enrique back. He then caught Jim attempting to attack him from behind. Though reminded that the bridge would never open without him, Bular stated he'll just use another Trollhunter. But then Jim summoned his sword to his free hand cut Bular, forcing him to release the boy. The Trollhunter then sympathized with Bular's desire to see his father once more, but stated they don't always get what they desire. Enraged, Bular attacked Jim again, forcing the boy to seek the safety of daylight. Standing over the Trollhunter as the latter stabbed his sword into the side of the bridge, Bular mocked that he assumed Jim's death would more entertaining that Kanjigar's. Catching Jim before he could fall, Bular pressed him against a wall, stating that the amulet should never have chosen a human.

Ultimate Demise
As Jim's friends wash up in the shadow of the bridge, Bular taunted they're going to watch their Trollhunter slain. Jim reminded he was no troll and removed his armor, enabling to slip out of Bular's grasp before stabbing him through with the Sword of Daylight, causing him to fall off into the sunlight and petrifies as he falls into the water.

However, Bular was far from finished. Even as he turns to stone, Bular ascended the bridge, catching the Trollhunters by surprise, only to be punched and shattered to pieces by AAARRRGGHH!!! before he could crush Toby.

"Return" in an Alternate Reality
Bular makes a brief return in the episode "Unbecoming", in which Jim is given a second chance to live his life without ever having found the amulet. In this universe, he ends up winning the battle and freeing his father.

Physical Appearance
Bular is a large Gumm-Gumm Troll with black skin, yellow and orange eyes, and a set of horns which curl around his face. He wears a kilt with a wide belt, decorated with skulls, and two belts across his chest, which hold his swords. He also has a leather wrap on his right arm, and what appears to be hair on the back of his head.

Personality
Bular is monstrously arrogant and cruel to friend and foe alike. He is quick to anger and quick to act and enjoys lording himself over his subordinates. Like many trolls, Bular is dismissive of changelings, seeing them as fodder or cheap labor to further his plans. Bular is devoted to his father Gunmar and will stop at nothing to bring him back to the surface world.

In many ways, Bular can be considered an evil version of Draal; both are arrogant, dismissive of those that they consider weaker than themselves, and rash. They both also wish to live up to their fathers' expectations of them. However, unlike Draal, Bular never learns humility and the value of true friendship, which leads to him dying alone against the might of Jim and his friends.

Gumm-Gumm Troll Physiology
Bular is much stronger than a human and even the average troll. He is able to easily toss a truck aside and burst through a sewer cover. Bular's thick skin makes him more resistant to most blows. However, like all trolls, he cannot withstand sunlight or the Sword of Daylight. Despite his bulky build, Bular is able to move much faster than an ordinary human on foot. He also possesses enhanced reflexes, which aid him in swordsmanship

Swordsmanship
Bular is an excellent swordsman, capable of taking on a fully fledged Trollhunter in Kanjigar and defeating and disarming him. Blinky himself even claims that Bular is a formidable opponent. He specializes in ambushing his prey and using powerful strikes and crushing grips to overwhelm them. He is equally proficient with one or both of his twin swords

Twin Swords
Bular's twin swords are his weapons of choice, which he uses to defeat Kanjigar and later fight Jim on multiple occasions. Bular also uses his weapons to intimidate and threaten, as seen when he menaces Strickler for arguing with him and when he attempts to coerce Jim into giving up the amulet. Bular's weapons are stowed in sheaths on his back when not in use, and it is assumed that they were destroyed when he was killed by Jim and AAARRRGGHH!!!

Trivia

 * In an interview, voice actor Ron Perlman described Bular as "being pissed off all the time."
 * Bular's merchandise is branded as "Trollhunters: Tales of Arcadia" even though that's the name of Parts Two and Three and he was killed in Part I. This seems to be some renaming of the series since all existing merchandise is from Part I and nothing has been announced for new characters of Part II.
 * Bular's arm turns to stone in the first episode, leaving him with that handicap for the duration of his future appearances set in the present main reality. This is most likely a homage to Ron Pearlman's previous role as the character Hellboy, who also had a stone arm.