Nino Ally Support

I'd say that Nino works better with Ephraim because he checks red better than Eirika (especially with TA) and Nino checks greens and blues to keep Ephraim safe because he can't really tank blue mages unless he has b tomebreaker which is not really worth it anyways because Reintard kills him anyway.

Tharja is a weird one tho. She would also be fine with Ephraim (better than Eirika who has the same color as her), so I'm not really sure. Surely someone else will sugest a better option.

I personally consider Eirika better than her brother on most teams due to her speed and stat spread myself and because she is far more attainable with ideal ivs than her brother. Unless you want a hard counter for reds with ephraim but even then swordbreaker Eirika will handle such just fine anyways as well.

It will depend more on your team lineup for them both and all that but if I ever got around to it I'd prolly match my Nino to my Eirika because they'll always be close anyways for buffs and I don't own the brother of te pair anyways.

My vote is for a +Spd/-res (or hp) Eirika with swordbreaker and either TA or Fury as you prefer

I personally consider Eirika better than her brother on most teams due to her speed and stat spread myself and because she is far more attainable with ideal ivs than her brother. Unless you want a hard counter for reds with ephraim but even then swordbreaker Eirika will handle such just fine anyways as well.

It will depend more on your team lineup for them both and all that but if I ever got around to it I'd prolly match my Nino to my Eirika because they'll always be close anyways for buffs and I don't own the brother of te pair anyways.

My vote is for a +Spd/-res (or hp) Eirika with swordbreaker and either TA or Fury as you prefer

Ephraim is the best Nino support character. He can give Nino a ton of buffs, and if you do the support link, that's the even more to the list. I really would say Ephraim over anyone else :)