You’re very welcome, I know how confusing and overwhelming it can be at the beginning when you have so many characters that need leveling.
Wu Kong will be the most help to you for getting you mats to ascend your 4* and 5*. He’s great for titans and events, and can help you raid or complete quests that would usually be above your pay-grade. He’s obviously a gamble, but he helped me complete quests that I normally wouldn’t have been able to. Once you do get him, I’d suggest using your specials before setting him off, as it can really blow if your heroes miss. He will help increase your tile damage like no other, so I would use him specifically for that purpose.
Chao is better than given credit, I just prefer Wu and Jackal. He’ll be a great help to you in events and raids. Mana reduction is a very important tool to have at your disposal.
Now the jury is still out on Aegir, but I think he could be very useful as long as he’s used correctly. I haven’t figured out how exactly, but maybe paired with Wu his healing would take better effect. He’ll be nice for survivability, so he’s someone I would take in if I was shooting above what I usually could handle, as a safety net of sorts. Not the best choice, but I think he could work.
By feeding two different heroes in a color at the same time (though, it’s spread out over a few weeks), do you find it takes a long time? I’m just wondering, because typically it’s better to focus on one until they’re maxed or stuck, then move onto another til they’re done. If this method has been working for you then I wouldn’t change it, but if it isn’t then I’d stick to one at a time instead. Totally your call though; I completely understand the temptation to get a lot of your heroes leveled all at once, especially when you have so many.
Basically all of the 3* you’ve listed are the best, but I’ll list all of the ones you want to keep an eye out for just in case you either don’t have them, or haven’t worked on them yet:
Red: Hawkmoon, Nashgar (solid attacker), Azar and Namahage (missing Nashgar)
Blue: Valen, Ulmer (for defense down on all), Gunnar (for the spirit link) and Gato (missing Ulmer and Gunnar)
Green: Belith, Berden, Brienne, Mnesseus (looks like you have them all)
Yellow: Bane, Gan Ju (mana control), Kailani (another link) and Melia (missing Gan Ju and Kailani)
Purple: Balthazar, Tyrum, Chochin (mana gen) and Gill-Ra (cleanse) (missing Chochin and Gill-Ra)
Those are the best 3* (not including seasonal), so they’re ones I would work on after you get a few teams of 4* together first. They’ll be fast and help you for stacking, war, and challenge events. The ones your missing could help you, but ultimately it’s up to you if you want to collect and level more. You already have quite a few good ones, I just think it’s better to have more options just in case. They’ll mostly be there for challenge events, since you’ll eventually get enough heroes to replace your 3* for war if you do a lot of pulls or run TC13 or 20.