World Transformations (The Chipmunks and Company)

Atlantica/Oceana/Atlantis (The Little Mermaid, Barbie in A Mermaid Tale, etc)
and more
 * Alvin: a chipmunk-merman with a red tail
 * Simon: a chipmunk-merman with a blue tail
 * Theodore: a chipmunk-merman with a green tail
 * Sora: a merman with a dolphin tail

Other World Transformations

 * Timeless Universe (Vintage Cartoon Shorts):
 * Alvin, Simon, Theodore, Sora, etc: Black and White, 1930s retro designs
 * Metropolis (Superman 1940s cartoons):
 * Alvin, Simon, Theodore, etc: 1940s animated artstyles
 * Caillou's Neighborhood/Ms. Martin's Playschool/Farm/Joseph's Ranch/Village/Town/Big City (Caillou):
 * Alvin, Simon, Theodore, etc: Same artstyles as Caillou designs
 * And More World Transformations