(i apologize, but i might not be understanding this question correctly, so here’s two answers, one of which i assume will answer your question. lemme know if neither do)

if you’re asking why penny (the yellow fairy one to the right) has a glow effect, penny, the yellow character from gumball shown in the image, is capable of emitting light while in the dark. i didn’t edit that in myself, it’s just part of the show.

if you’re asking why stick-minikiwigeek (the stick figure guy to the left) is unusually bright compared to the other characters next to him, i was a bit lazy when putting him into the image - it’s not really my favorite out of the ones i made lol