Yeah, I was hoping to duck on the 5*.
Good news: these are all solid 5* with a place in the meta.
Bad news: three of these are tanks (Justice, Richard, Kunchen).
Kunchen and Marjana seem like no-brainers to me to complete. Great healer, great sniper.
The other three are trickier to sort. Richard is a fine blue tank, Justice is a fine yellow tank; both benefit from paladin emblems. Isarnia is a terror, but slow mana; on titans a big mana pot fixes that. Also her -defense debuff is overwritten by Kunchen’s and Grimm’s.
If you need to choose only one blue 5* and one paladin, that takes you to Isarnia and Justice.