I am having a 2v2 tournament with about 10 of my friends. I was wondering if there were any good champions me and my partner could play.
Note: Each team gets 2 bans so if there were any champions that countered this combo could you let me know. Thanks! 
I'd imagine you're best off with a strong peeling champion and a strong damage champion who has some self-peel or mobility.
The damage champion is probably best off as an adc, something like tristana, corki, ezreal, graves, vayne (anything with strong self peel).
Since the damage champion is ad, your peel champion might ideally be ap. Maokai comes to mind. Although if you pick a caster adc you could go with Leona, braum, alistar, etc...
Or you could just go with 2 mobile assassins.
