Suicidal thoughts are on the horizon again so I'll write out this completely biased opinion out to keep it at bay.
RussianFury: Stay. Good player, used to dominate the groupfight scene although now he routinely gets ass-fidgeted. Anger management would probably go a long way, but it's not as bad as it used to be.
Who-: Stay. Every time he came back he was on top, and that is usually only every 5-9 months in the last 3 years (excluding the 2ndQF reform).
Coconut: Conflicted. I don't fucking remember his style at all but he was nice to me so I guess that counts for something.
AsianP: Stay. Probably the best all around player for the duration of his career. Drugs may have been involved but I wouldn't know anything about that.
JackieChan: Stay. Outside of his NANWL contributions I don't recall much of him before the 12th, but the 71st version was when I considered him top.
Zzehth: Stay. Simple style, nothing complicated, and worked well with Jackie.
Zorkoth: Stay. Was rarely not high, even in the 7thRF (I think that's what it was called, can't remember now). Pretty good with his fists too.
BillTheButcher: Stay. Despite his inflammatory personality and strenuously drawn out style, he ranks as one of the best imo.
Fireboy: Stay. Has badly threw the majority of the duels he has been in, but his groupfighting is fine.
Breaches: Conflicted. Used to down spam whole lines, but I don't recall much more than that outside of a few tournaments.
Rafael: Stay. Consistent in all regards, though I don't remember him much prior to the 58e.
Steven: Stay. Stable player, rarely cracked, I don't know much about the impact however.
Ghost: Undecided. Insulted me once in chat when I was 13 and that was about it, but people say he was good so yeah.
DjOverjoy: Stay. Similar to Who-. He can come back without practice and still fuck 98% of this community without much effort, and is a good groupfight coordinator.
Achilles: Stay. I could never beat him personally, which is apparently an experience many others had, so I'd say he was pretty solid. Catgirls on the other hand...
Skinny: Stay. Core 71st, and a nice guy.
Godfreid: hmmmmm. Wins almost every duel he fights in, official or not, but his groupfighting is on and off. Recent hacking allegations have put him under the spotlight, so this may change. /s
Kovy: Stay. Spam and spin, but did it better than almost anybody else. He also called me the n word which I took as a compliment.
Pinoy: Stay. Broke game mechanics and possibly has the shittiest looking graphics for this outdated piece of garbage we call a game, but he fragged a ton so that is good in my book. Also yells at his mom.
Suns: Stay. Noticed him more around 2015 and 2016, where I'd say he was one of the best. Then descended into the Vetro rivalry, which I still don't know what to make of.
Pj: Stay. Bullied me in the 3e, but his sense of humor and groupfight skills made up for it.
RitZ: Stay. Probably the top 3e player at its height with a playstyle that gave me seizures. Also props to Sandarian for withstanding his racial remarks.
DarthJezus: Undecided. Don't know much about him other than his 9y reign and his friendship with Ramzay.
Alexander: Conflicted. I really, REALLY don't know about this guy. His screaming tendencies were mentally invigorating, but his melee was on and off at times I feel.
Moose: Undecided. I don't remember much, sorry.
Mathias. Stay. Won a big ass duel tournament, and then everybody made fun of him when he lost a casual duel. Nice dude.
Lithios: Stay. His feints were oddly slow but worked well enough to fuck everybody else over, and would routinely beat other top duelists way back when.
Blade: Stay. Good clutches actually, and his dolphins worked the majority of the time, which is something I can't say for myself or the vast majority of its users.
Tammo: Stay. I don't want to say he was the outright best player there was, but his chambers were practically perfect, and his groupfighting skill wasn't half bad either.
Redrum: Stay. I still think he was the best of the 63e, but I'm probably putting on the nostalgia glasses with this one. His mom also beat him so there's that too I guess.
AP0C: Conflicted. I don't remember much of him at all, but people all over this forum have various opinions on whether he was a mechanically sound player or an overcooked tater tot.
Krastinov: Stay. From a more objective standpoint, you could say he was the best 63e, but once again I don't know enough about their history to make an accurate assumption. He is also a furry so I don't know how to feel about that personally.
Havoc: Stay. One of the few names I can recall clearly from years ago. Was always a top player, and made it to the top easily not too long (relatively speaking). Although, if I could make one complaint, he could go without screaming at the top of his lungs when he would die.
Maple: Conflicted. I have no idea honestly. I'm forgetting a lot recently so I just can't remember if he was top notch.
Colonys22: Conflicted. As previously stated above ^
Puppytron: Stay. All around good player, not much more to add.
Pointblank: Undecided. Outside of the 1stFKI, I don't recall much about him outside of a 2v2 tournament, which was before I could even right click.
Silentman: Undecided. I recall him going batshit insane and calling the whole community a waste around 4 years ago. Other than that I don't remember him except being in the 63e, I think.
Mang: Stay. Quite impactful as a player on the overall (emphasis on impactful). Although the wars he waged against multiple administrations, as well as a myriad of other things, has gained him a rather mixed reception amongst the community. Hopefully Juvenile School helps him out, but I wouldn't know much about that.
5hine: Whatever I say will probably get Fireboy angry so I'll just slip past this one.
Sleek: Stay. He is ok.