Lady Waltham (KH III)

An aristocratic lady and the sister of the deceased Clayton who wants revenge on Tarzan and Sora for killing her brother (at least, in her own mind). She allied herself to Master Xehanort as one of his bounty hunters for hire, given the task of hunting down Sora and his friends in their home worlds with the help of the Heartless. She had her valet Hobson capture those close to him and she then poisoned Tarzan. Tarzan was then given a challenge by Lady Waltham which was either save those he is close to from danger or head to a mountain she dubbed "Clayton's Peak" where the antidote is. Though Tarzan managed to save his friends and family, he then ended up saving Lady Waltham from a herd of invisible Steath Sneak heartless that sought to claim her heart due to the darkness that was growing inside her heart. Afterwards, she gave Tarzan the antidote realizing that Tarzan would never have killed her brother. She thus resigns from Master Xehanort's service, but not before she learns of Clayton's resurrection as a Renmant and subsequent corruption into further darkness.

Although Lady Waltham is an antagonist to Sora on his adventure, she is not fought as a boss. Instead, she indirectly summons the Stealth Sneak army that was planning to consume her heart.