Could be different reasons but heres a few.
All of them (except Nightmare)
Quentin Smith. I got Vigil from the shrine not long after and I don't really care about him or his perks right now... Maybe if he got his face reworked to resemble a little more of the movie, I'd consider playing with him. But anyway, I hate his perks. Should've just bought Freddy.
I also regret buying Deathslinger. I like Zarina, but I don't like him or his perks. I'm horrible at aiming: what was I thinking?
Legion. Doesn't saw the changes comming, as a newbie that I was back in the day.
A bit Freddy, for the same reason as by Legion. Other then that, nop. But I haven't buy much. Before I spent much more money on something, I like to have fun with the product and also to be sure, that I get for my money a product as it was advertised.
That is not ment to be a rant. Please don't let us do it here. Just my point of view.
Not really. Piggy was kinda dissapointing, but thats it.
My all time favorite Killer I've bought is Legion. Went from Rank 20 to Rank 1 before I even tried another. They were the reason I switched from a pure Survivor player to a Killer/Survivor flex.
Bubba is probably my least favorite Killer I've bought. He feels really terrible to play and I only got him for BBQ. It was about 2-3 months before BBQ went on the shrine so the bloodpoints I earned were probably worth it. But it's just sad that I have a Killer that I hate that much. He does horrible in emblems because he's an insta-down Killer and the clumsiness of his power is just awful. It feels like you have no control over chase because you have to hug corners to get kills but the hitboxes of the environment are so weird that you sometimes hit things and go in to tantrum and feel absolutely cheated out of a down.
Legion. Haven't played them in a long, long time. Haven't wanted to.
I'm pretty much with you on deathslinger. Really didn't think long term. The other is plague and jane. I was still new when I bought the chapter didn't realise I could have bought plague on her own. I've used jane a couple times for dailies and thats about it. Plague has decent perks but boy do I struggle to play her.
Probably none that I harshly regret, because I either like their appearance/power (survivor/killer) or I like the perks I gained access to through them.
If unique teachable perks weren't a factor though, then there's only on killer I would probably consider a regret and it's Plague. I do not like playing Plague.
My alt-pick would be Hag, but I got her for free (benefits of being a console player) so she doesn't count.
Deathslinger is another one for me. Same with Legion. Like, I can do well with Deathslinger. I've played FPS most of my life and because of that his ADS is hilariously easy to abuse. But I don't find him fun. I had a BLAST with him and the new map is his launch month. But I've never really had the feeling to go back and play him again.
I bought the game in the first place specifically for Pyramid Head. After a few hundred hours playing it, Pyramid Head feels terrible to play. His shockwave is the only decent part of his kit, and it is trivial to juke for any player that is looking at the red stain. His torment trails are embarrassingly useless and all but TWO of his addons affect them, basically meaning he's a killer with no addons. Moreover, almost all his stuff seems to be focused on being Undetectable for some reason, as if the lack of a terror radius makes up for the fact that he's gigantic, makes a ton of noise by just walking, and using his power in any way is as loud as a generator exploding.
What feels even worse is that the inevitable response is "actually, pyramid head is really good because he can blah blah loops." No. That doens't make him good. Having a thing that makes loops slightly less safe if the killer flawlessly performs a trick AND the survivor isn't paying any attention at all is a terrible power, much less that the recovery is so long that the survivor may as well be getting a free Sprint Burst every time you miss with it. Or "actually, his torment is super strong because it negates all the survivor hook perks." No again. It takes so much time to set torment trails, they can't be set in the spots every other trap can, AND there's a very severe hard cap on how many trails you can have and how long before they fade away. The only time people get tormented is if they run over your trail in a loop, which is, at best, one person at a time. The killer instinct alert is so short as to be pointless, the trail neither damages nor slows, torment does not affect player actions in any way, rescuing from a cage removes up to two instances of torment making you have to start the whole process over again, and even if you DO get a cage off, you're shutting down all the killer-hook perks as well as just shipping them off to be grabbed by the survivors working on gens far away from you.
The core idea of the killer powers is so neat, yet what I can only assume is the result of endless survivor complaints has delivered a wildly under-utilized kit that boils down to "short range huntress." The fact that the last attention he got was in the form of a shockwave nerf with zero buffs to his torment trails or his totally worthless addons kinda tells me that the developers are fine with where he's at, which is a tremendous disappointment for me.
There are lots of fun killers to play and I really wish that the guy who got me into the game in the first place was one of them.
I was really starting to thing I was the only one who felt this way about PH. Yes cages are useful againt this and that but negate my favorite slowdowns (pop, dying light) and other general hook idea perks. Agree about the trails as well. PH just not one of my favs right now.
Well Oni and Deathslinger are the only ones I probably will never touch again. But then again I bought them with shards so whatever. (Oh and Huntress but she was free anyway)
No I do have favorites but I secretly love them all.
Oni. I suck as him. Tried to learn and practice and could never get the hang of him.
Chains of Hate chapter, weaker killer and no perks on either side that are really good, just the situational For the People and memey Red Herring.
I regret buying laurie spirit and deathslinger.
Legion. I bought the gang with Iridescent Shards so I could see what it was like to play them before they received their most recent adjustments, and now I'm getting killer dailies for them, and I absolutely hate playing them now (because I comfortably am accustomed to missing on other killers and doing just fine otherwise). Same goes for Plague.
Edit: I would say Doctor, but I don't regret the time I had with him before he was made unenjoyable for me.
I don't really regret buying anyone, I don't play Hag much, but her teachables are dope.
It'd be nice if they brought Old Freddy back, I never got to play him. Same with Old Legion.
All of them. Bought them all to support bhvr when they said, back in 2018, they would get 60 fps on consoles. How fool i was
Ghostface and Plague. Not because I hate them but I used Auric Cells to buy them instead of buying them through the steam store and so I didn't get the unique item piece for Ghostie or Jane.
Not a huge deal, but I regret buying them wrong.
Oni: not fun to play as imo.
Felix: perks are borderline useless.
Demi: fun, but weak.
Blight: his only power is movement, can't cut off loops. (Or I'm just bad)
Freddy, after the rework is so damn boring.