Jack

ジャック

Jack is the son of Jake, a Cross Guard member who was killed by the Chess Piece Weasel.
Loud-mouthed and clumsy, Jack is the weakest member of Team MÄR, though certainly not the least resolute—if anything, the most—and he has the least experience. He never misses an opportunity to train and grow stronger. He also harbors a hopeless crush on every cute girl he sees, particularly Snow and Dorothy, regardless of how cruelly they treat him.
Jack is the one who encounters Ginta Toramizu early in his adventure when he and Babbo stumble upon Ginta's garden. After Jack helps him defeat the Rugelu Brothers (a pair of werewolves terrorizing Jack's home to seize the farm's vegetables), he and Ginta become best friends, and Jack joins Ginta on his journey.