[tosh]

Just sent you a friend request, Manti. In-game name is Jess.

I typically have LKali up in my friend slot and she synergizes fairly well with Yuna (save for the fact that you can't use wood to activate LKali's leader skill).
A leader I have that works a little better with Yuna is Xiao Qiao. One thing to watch out for is that Yuna's leader skill doesn't include hearts as part of the activation requirement, so you probably shouldn't use Xiao Qiao's active skill since that would prevent you from activating Yuna's leader skill. Don't be afraid to message me if you want her up.

With Chaos, a few leaders you can pair with are d/g Alraune, Ronia (Red Sonia), and Beelzebub.