The one who meets Ginta early in his adventure and after the boy helps him beat the Rugelu Brothers, a pair of werewolves that were terrorizing Jack's home to claim the farm's vegetables, he and Ginta becomes best friends. Loud-mouthed and clumsy, Jack is the weakest of Team MÄR (though he is still on par with a knight), however not by any means the least resolute, if not the most: he never misses a chance on training to get stronger, first not to be a burden to others, and second, to avenge the death of his father Jake—a former soldier of the Cross Guard—who died in the first War Game at the hand of one Zodiac Knight, Weasel. He also has a hopeless crush on every cute girl he can lay his eyes on, especially Snow and Dorothy, despite how cruelly they treat him. Eventually, his luck with females changes as he gains former Rook Pano as his girlfriend. He is a user of plant/earth-type ÄRMs.
Battle Scoop/Battle Shovel: Also called the Earth Scoop, a Weapon ÄRM that Jack's Dad left for him that can also be used as a weapon. The ÄRM's typically horrendously weak, it is afterward upgraded by Dorothy with magic stones.
Earth Wave: Using the power of the magic stones, Jack's Battle Shovel sends out a small earthquake towards his opponent.
Earth Beans: Jack scatters several small beans on the ground and uses his Battle Shovel to make them instantly grow into giant vines to snare his enemies.
Magic Mushrooms/Funky Fungi: Jack spreads spores onto his enemy that quickly sprout into mushrooms. These mushrooms then emit hallucinogens into his enemy, causing them to see illusions. The hallucinations, depending on the person, will differ. If the person is optimistic then the hallucinations won't be as bad for someone with a pessimistic personality.
Beans Shield: Jack uses his Battle Shovel to instantly grow a giant, hollow bean that he can then hide inside to avoid attacks.
Beans Shield Version 2: This was first shown in his fight with Vidar, Jack uses one half of the Beans Shield as a portable shield to defend with.
Mehitos: From beneath the ground, this cephalotus Guardian bursts forth to Jack's summon and, under his commands, consumes all adversaries.
Poof(Will 'o Wisp Fire): Using a ruby-engraved ring Guardian ÄRM as a medium, Jack calls to his side a flame-haired cheery midget donning Arabian clothes and when the order for destruction is issued, it will practically reduce everything to ashes with its flame.