Steven Universe - Lilo is to dads as Steven is to moms.

Quite a lot in common Lilo and Steven have:

-Caught up in intergalactic strife
-Has aliens for family members with only one human family member
-Plays ukelele
-Lives in a beach house
-Even wears sandals

If there's a crossover that should happen, it's with them two!

Oh, you have no idea.

Just slightly less crossovers than a superhero comic