Jirachi has a yellow star shaped head with three blue tanzaku strips on his head. He has a white body with a slit on his torso (canonically a third "eye") and has light yellow wings that lost the ability to fly around the ending of Out In the Reign Because Jirachi is initially considered to be the second most powerful Mythical Pokemon, as it's established that he's second in line to Arceus[1], he abuses his rank and wishing abilities to wreak havoc and cause mayhem. He's pretty carefree, and acts rebellious, as according to him, the Legendaries don't follow the rules, so "why should he?"[2] This implies that he was once an obedient and decent legendary who initially followed the rules, but after witnessing the Legendaries constantly breaking the rules, had his behavior negatively influenced and began his rule-breaking nature. Jirachi acts overly confident in his abilities due to being able to wish his way into getting out of problems.