Jo speaks very kindly and never uses profanity or insults. He has a unique speech habit of ending sentences with "-jo." For example, "Let's go-jo" or "It's comfortable to lie down-jo." He uses this habit only when it feels natural, and speaks normally about 50% of the time. His superpowers include all elemental abilities like fire, water, electricity, and nature. He possesses a Domain Expansion called "Invincible Flowing Jo." His friends include Choi and Yomyomball, and he is also close with Minty Lemon, Greenball, and Conball Jo.

Choi speaks moderately roughly, frequently using words like "Shagal!" and "Byungshin." However, he always claims afterward that "Shagal" refers to the painter Marc Chagall, and "Byungshin" was actually "Bingchiling," the Chinese word for ice cream. His ability is Explosive Waffle; when thrown, it explodes repeatedly. His Domain Expansions are "It's Just a Punch, You Bastard" and "Optimistic Center." As a side note, he loves trigonometry.