Some backstory I guess? Probably not too interesting. :P



So Diablo babysits some kids sometimes and he'll bring them to Zero's house sometimes too. Zero likes to keep himself away from everyone and especially small things like kids or pets because he thinks he'll hurt them ( even though he's never hurt anyone before)
But he's also very protective, cuddly and playful, and can almost forget that he wants to stay away and ends up spending ages cuddling and playing with them. And he also seems a lot more relaxed when he's with them too.

(Also Diablo's kinda similar, just a lot more childish, crazy and excited when he plays.
Red doesn't like it too much when Diablo babysits tho, kids can kind of annoy him and it gets too loud...)