These are the only non-duplicate heroes I have that aren’t maxed or almost done in these 3 colors, and am trying to figure out who is next. I’ve put them in the order I am thinking of doing them. All except one are sitting at 3.XX where the XX is max level for the third chevron.
Green (all 4*):
Jack O’Hare
Gobbler
Skittleskull
Purple (all 5*):
Sartana
Obakan
Quintus
Blue (all 5*):
Magni
Richard
Thorne
Thanks in advance for your help.
Jack O’Hare, Sartana, Magni (Gobbler is food).
I agree with that order! 
Green - None
Purple - Sartana
Blue - Thorne (odd choice but I am thinking potential future costume)
I would switch Gobbler with Skittleskull for the Greens.
THough Skittles is slow, the attack debuff can be helpful (Skittles was my only attack debuffer when I beat Ursena on hard mode, and I kept losing before I brought Skittles along… defense buffs from Kiril/Aegir were not enough!). Good tile damage too. and Skittles is sturdy enough that when I do bring her in raids/war she usually manages to fire once. Not my top choice, but has been useful.
Gobbler on the other hand is so frail, that even with average mana it’s hard to keep him (her?) alive.
Agree that Jack should be first. Great attack stat and fast mana means he goes off multiple times before he dies, even with the defense debuff.
Thanks, everyone. I’m going with the first heroes listed, and hoping I get a better Green than Skittleskull or Gobbler soon.
Yeah but what about magni potential as well
Probably like another Lianna and Joon.
A sniper will be a sniper.
Thorne will be a high stats hit-3 hero.
Will be something to look out for.