Okay, my slightly more comprehensive breakdown. Please keep in mind this is all based on personal opinion and/or personal experience
Lionstring - I’ve only recently got this hero and haven’t used him much yet. That being said he looks merely “okay”. The never missing bit seems good and the healing reduction will be helpful if used with a fiend summoner. Sure I’ll max him at some point. I’d probably keep him at this stage
Juliani - Another recent acquisition. Slow speed and only effecting target and nearby puts me off a bit. The extra damage to holy and poison damage looks fun but I’m in no hurry to level this owl. The flat damage dealt could become outdated quickly however 4* heroes seem to suffer less from that than their 5* counterparts. Not sure if I’ll commit the time to this owl
Lexi - Could’ve been a really good 4* hero but sadly is just meh. The EDD is less than Sergi, who I also have, so she’s nowhere near my must level list. Soul connection does not make up for it. I might use her in a mono purple team but I never go mono so chances of her getting a run out outside of the Purple contest of elements is slim. As I have sergi she would be a candidate for the chopping block if I needed to free up space
Olbec - Hard hit at fast speed but that’s about it. The mana reduction doesn’t seem enough to make this owl a top 4* contender for me. Planning to level but could easily be persuaded to drop this owl, especially as I have no real interest in Juliani for the family bonus.
Raleigh - First one on the list that I don’t have. Slow speed is a bit of a downside but I like an overhealer and he gives a decent mana generation buff to the whole team. I would level this one if I had him even if only for rush
Nova - Love this girl! Maybe it’s because I knew a girl called Nova. Bias aside, 4* healing cleansers are not very common so that alone makes her useful. I have maxed this one and given her emblems. I switch between her and Boldtusk as my red healer in a 4* team. Sometimes I take them both. Keeper in my mind
Linus - Got excited when I got this guy but then looked a little closer and am unimpressed. I’m just not a fan of heroes who need x amount of tiles on the board to see their full potential. I’d let this one go if I required the space
Heifeng Huai - Maxed this guy and then got Koda. I prefer Koda. Don’t get me wrong, this guy is useful but mostly for the reset of ailments on the target. If you have other 4* def down heroes he’ll quickly go to the bottom of your pecking order. I could be convinced to drop him even at max as I can’t really find much use for him in my 4* roster
Villiers - I’ve been slowly levelling this guy for what seems like ever. I like his fiends ability to steal buffs though. I have no desire to let him go but am also in no major rush to finish him. Still a keeper for me
Meadow - Now that Monster Island seems to be back in regular circulation I’m definitely keeping this one. Okay damage at very fast speed plus poison makes her seem useful. Keeper for me
Mielikki (No Costume) - I was not overly impressed when I got her but then I fought against her and she’s a real PITA. Almost made me max an owl but I don’t think their passive works for the minions. I’ll max her even if only for the mana generation buff her fiends give but only after Villiers
Ptolemy - Maxed this one. Useful but I wish he protected the whole team as opposed to only himself and nearby. A keeper for me though
Anton - Got this guy and maxed him as quickly as I could at the time but then the disappointment set in. Maybe my expectations were too high. He never seems to revive anyone for me. Poison is meh but at least he damages everyone on the first charge though that’s not the main reason I used him. Spends most of his time on the bench for me now but I keep being told he’s really good for others. Maybe I’ll give him another run out. Keeper for now
Aodhan - I run hot and cold with this guy. Good for Bloody battles but then so are all fiend summoners. Outside of that I don’t really use him. I could be convinced to drop him but there would be others I would drop before him.
Lady Woolerton - My least favourite 4* yellow healer as she doesn’t do anything else and her mana is blocked for 2 turns after using her special. Used her with Ptolemy to negate the mana block but I hate using 2 healers next to each other. I’d happily drop her as I prefer my other 4* yellow healers.
As I said this is all just my opinion and what I would do considering my roster. Your view and roster my be very different
Whatever you decide. I hope it works out for you
Just one gamer’s opinion
Game Well