Yokoko & Gekoko

Yokoko and Gekoko are orphaned twins and  problem children that can't ever get adopted because of their bad  behavior. Yokoko is a prankster and general nuisance while Gekoko is her  quiet but just as guilty accomplice that does anything her sister tells  her to.

May or may not get adopted by Giroro and Dororo at some point because they're husbands and in love.