Anime Roommates

So two characters from an anime decide to share an apartment. Problem is, the said characters are completely unknown, and it is unsure if their personalities would clash.

This is the scenario- come up with two characters from any anime (either same or completely different series) that might be the absolute worst person to share living quarters or might sync up perfectly with one another. Be sure to list the anime the characters are from, and why/why not they should be stuck in the same place for an extended period of time.

I'll go first.

I think Professor Stein (from Soul Eater) and Russia (from Axis Powers Hetalia) would make perfect roommates. Just think-Stein is a very, very, VERY creepy, yet somewhat gentle and affectionate, man whose mental state is... on thin ice, and has an unnatural obsession with cutting, dissecting, and "experimenting" with every animal and human being he comes in contact.

Russia, trying to be friends with everyone, tries waaaaaayyyyyyy too hard to do so, and is insane to the point it rivals Stein. Plus, he emits a general aura of creepiness whenever he is pissed off, depressed, or feeling lonely that makes EVERYONE around him feel uncomfortable.

So, two extremely insane characters, both who can keep each others' madness in check and can repel each other if they get too close. Sounds perfect to me.

Nosferatu Zodd and Kenpachi Zaraki. Both are the very exemplar of the Blood Knight, willfully weakening themselves and only unleashing their full strength against a worthy opponent, sparing those who show promise. Their battles result in ludicrous amounts of collateral damage.

Now imagine them sharing an apartment, getting kicked out every time they end up fighting and having to look for a new one, and likely reducing crime to zero in the area.