We’re working on the S2 update to the guide, but it is getting harder as there are more heroes to compare. In addition, many of the new heroes have very complicated or specialized skills which make them hard to give an accurate letter grade in comparison with existing heroes. Here’s my opinion briefly, but note that it is not official.
Tarlak - A. Great for titans and raid offense.
Misandra - B. Potential for immense power when lucky, but lower average results than Magni, Alasie, or Arthur.
Proteus - A. Mana freeze is amazing, even though his damage is purely DoT.
Amoena - C. Ability is useless in 99% of situations.
Danzaburo - B-. One ability is insane, one is pretty good, and the 3rd isn’t a death sentence. OK but hard to use.
Wilbur - A-. Amazing but specialized ability. Great in a red stack in raids and titans.
Triton - B+. Hits like a truck and pairs well with healers. Healing increase isn’t a huge deal though.
Agwe - C. Mediocre damage with a mediocre ability. Boomer but blue.
Gobbler - B. Gamechanging ability when facing a Delilah, Red Hood, or Thoth. Very weak everywhere else.
Gadeirus - B. A mini Ares but on slow mana. Decent support hero.
Chochin - A. Great damage and unique ability at the 3* level
Gil-Ra - C. Status ailments without damage on slow mana is too hard to use.
Melia - A+. A must have at the 3* level. Great damage with a great ability - only crit at the 3* level.
Gato - A. Great damage with a high attack stat and useful ability.
Mnessus - A. Good damage with a cleanse. Mini Caedmon.
Nahamage - B. Hits hard but doesn’t compare well with Wabbit, Nashgar, and Azar.
Edit:
Sumitomo - B. Good damage and strong riposte, but having it on just himself is weak.