I picked Nordri to further improve your scores against red titans. also good in events and tournaments. but:
Sonya is a staple, you can’t go wrong with her, and is even better once you get her costume. if i run out of other blue heroes to work on, i’ll do a second one for wars and i don’t often max duplicate heroes.
Joukahainen is very very good in 3* tournaments, great stats and extremely useful skill.