|Game Debut||Danball Senki W (PSP)|
|Anime Debut||Episode 34 (W)|
|Appears in||Game, Anime|
|Occupation||Fire Sweets Captain|
Analagous to his squad's name, his hair has a fiery image with crimson red on the top, with orange on the back sides.
His army uniform is metal black with orange lining on his knees and hips. His uniform consists of ceramic plating on his knees, arms and wrist, back and chest.
An obedient soldier compulsive to any orders, but loyal to what he sees in battle after being shown evidence that Ban and the others were telling the truth.
He was first seen training his squad until orders were compelled to intercept "the intrduers" and taking them into custody. Jack battled against Ban, Ran and Hiro with his Proto I, overpowering them with his veteran skills and the utilization of Proto I's "special joints". He managed to push them to the corner of defeat, while refusing to believe about the president taken hostage and Gardyne was the real enemy, In the end, he was defeated by Sigma Orbis after learning of Proto I's weakness, and became their assistance after realizing they were telling the truth.
- His army rank is 1st Lieutenant (中尉).
- His name, Gelato is the Italian word for ice cream, a reference to part of his squad's name.