Board Thread:Poll Archive/@comment-24095889-20140415141927/@comment-11491781-20180415052507

They're robot counterparts built at the same time to be male and female version of each other so they're kinda twins i guess

but mostly counterparts, like:

powerpuff girls to their respective rowdyruff boys

arale to that robot guy who is a male version of her and who she ends up marrying in an episode set in the future

dawn\hikari to lucas\kouki in pokemon diamond pearl platinum