I’m in a similar situation, except we are actually maxing out around 3-star Titans due to our small alliance size (4-5 active players; friends and family alliance). I’m pretty easily doing twice to three times the damage of anyone else in my alliance (been playing longer, and had better summoning luck). If that’s you, you could max Ranvir and your Titan scores go way up, and your alliance still wouldn’t get much better Titans to fight.
So, how much better are you than the other folks in your alliance, and do you see that changing any time soon? If the answer is that you will probably be the Big Kahuna for a while yet, you might consider Vivica. Five-star healers are very rare, and while she won’t help with Titans, she could potentially help everywhere else. I have both Wu and Ranvir, and I haven’t touched either one yet because a) I have a ton of good yellows; b) I have needs related to class trials that are more important to me right now; and c) I don’t think I would move the needle on the Titan levels we fight even if I had either one of them ready. I will take Ranvir to 2^60 next, I think, but it is as much for his druid class as for Titans. I have read that his special has to be at or near max for him to be really useful, so I hope to accomplish that as well, then try him on Titans and see how it goes. He isn’t going to die at 2^60 against the Titans we fight anyway. Maybe I’ll be really impressed. I could see giving him orbs to go to 3^70, but when it comes to darts, I can’t imagine him leapfrogging Onatel or Leonidas for me.
I definitely agree with the others about finishing Wilbur. I wish I had him to work on. As much as I like Gormek (my best red), Wilbur would be better, and he is a non-yellow monk, which seems hard to come by for class trials. I’d also think pretty hard about maxing that Grimm before starting Magni or Richard. Grimm is a beast, and he does really well on barbarian class trials because the mobs/bosses are heavily red. Are you currently finishing all stages of the barbarian trials? If not, I’d go Grimm. Azlar will want all those emblems when you max him.
The competition is less in terms of good yellows, and you have the darts, so I think the time is right to work on Vivica or Ranvir. For red and blue, I think you have really strong four-star options that you can max faster and get more use out of. I have applied this advice myself. I maxed Poseidon (my only max five-star) pretty much immediately, but I have put Domitia and Thorne on hold multiple times for useful three- and four-stars in their respective colors. I’m back to Domitia again, but Thorne is waiting on Kiril. I also have Leonidas waiting to proceed past 2^60 and Ranvir waiting to get off 1^1 while i finish Li Xiu (who I didn’t have when working on Poseidon). If you do decide to do a five-star blue, definitely Magni over Richard. Good luck.