Victor Frankenstein is a clever and industrious 10-year-old boy who is inspired by science.
Sparky is a devoted and playful bull terrier whose sense of curiosity is matched only by his beloved owner, Victor.
Nassor is highly intelligent, serious and intense. He takes a darker, more doomsday view on life than the other kids in New Holland.
Weird Girl doesn't fit in well with the other kids in New Holland, but it's easy to see why.
Toshiaki is over-achieving and mega-competitive. He delights in beating Victor at his own game.
Bob is a momma's boy who is the brawn to Toshiaki's brains. He is agreeable and never mean-spirited.
Edgar 'E' Gore
Edgar "E" Gore is a needy misfit who doesn't have friends but is desperate to be Victor's partner for the science fair.
Elsa van Helsing
Elsa lives next door to Victor and also has a beloved pet, her poodle Persephone. She empathizes for Victor when he loses Sparky.