Teammates for Jaffar and Mia

Brave Lucina could buff both Jaffar and Mia’s offensive stats, which would make her a really good supportive teammate for the both of them, as compared to Shiro, who is mostly self-sufficient. As for green units, I’m not exactly sure who you should go with as teammates, but Dorcas is a powerful unit who could handle blue units you may struggle with. Of course, if you have a Gronnraven/TA Inigo, he could easliy also check blues while countering colorless units, dancing, using Gale Dance, etc. He may stuggle to secure kills though with his low offensive stats. It’s your call, but I’d recommend Inigo.

Brave Lucina and Gronnraven Inigo seem to be good teammates for Jaffar and Mia as crkala said. Jaffar could probably use a more defensive hero to soften enemies so he can land kills, but his main use seems to be simply applying damage with Poison Strike and Savage Blow so that's unnecessary. My main concern would be cavalry teams since they have a longer reach than an infantry team, but Gronnraven Inigo would probably be able to handle the most common threats (ie. B! Lyn and Reinhardt). Overall, yeah, B! Lucina and Gronnraven Inigo seem to be pretty solid for your team, lol.