What can make a good killer?

Practise, is literally all it is.

Anyone who can sink alot of time into any killer will become God tier, Otz showed it with trapper.

In no particular order.

Fast map traversal (the ability to travel vertically, on demand, is a particular yet exclusive right to a select few)

Versatility (The power can be used in multiple ways, to achieve different things)

Chase-to-down time

Power can be used in loops in some way (this is where Wesker falls short, I think)

What do you know, Nurse scores high in all of those.

The player ultimately determines whether a killer is good or not, and the caliber of opponents measures how good they are in relation to others.

For example, although on paper Sadako shouldn't be good, players may have found ways to adapt her to a higher level of skill, or choose a different type of curse play. She also allows players to experiment, as out of her abilities, the ability to walk through players when not manifested is largely forgotten about in discussions, and that has some clever uses.

So, for me, on paper states how powerful they could be, but the player determines whether it meets, exceeds or falls short of that expectation. Even at the weaker end, in the hands of a good player a Trapper, Onryō or Pig can be your worst nightmare.

A good Killer needs to have good mobility and good anti-loop in order to be considered a good Killer. If a Killer is missing one of these or lacking in one of these then chances are they aren't a good Killer. Some examples of this are Killers like Deathslinger, Trickster, and clown AKA Killers with a strong anti-loop but practically nonexistent anti-loop which lands them low on the tier list. Then you have Killers like the Dredge, Wraith, and Sadako AKA Killers who have pretty good Mobility but little to no anti loop which usually lands them higher on the tier list than Killers with anti-loop and no mobility but still aren't considered great Killers. There are also some variations to this rule like Pinhead, Plague, and Nemesis who instead of having mab mobility have other mechanics that give them map pressure, usually a mechanic that forces the survivors to do something else other than gens (cleansing, solving the box, staying away from zombies, etc) but even with that they aren't considered to be great Killers because, in the end, nothing will compare to actually being in front of the survivors face and forcing them off gens.

All the ranged killers (sans Deathslinger) have snowball potential. They do not have the chase potential that the moving/hitting killers do. It’s good. Not consistently the better ability.

For the sake of the argument, Trapper is also a killer with high snowball potential. In certain circumstances.

Lol @ anyone thinking this is a tournament game or should ever be considered a tournament game

Movement speed or teleport fairly quick and power be useful in looping.You got that killer? here is my wallet

Anti-loop and map pressure. So Blight and Nurse basically

A good killer is when people start complaining about them that they are OP and have no counterplay, i.e they have to play different then against other killers and we know they don't want to 😜😂

So as people have pointed out these aren't tournament statistics. People are not going to play sweaty all the time. This is a game its supposed to be fun.

That said with the question of what makes a good killer depends entirely on what type of gameplay you are looking at. There are basically three things you can be looking at here: Competitive, High skill Ceiling and Low Skill Floor/High RNG.

For Competitive- These are killers that would be best on the competitive scene. They need the ability to get hits quickly by countering loops and distance and the ability to utilize perks and add ons to increase their power. They also need to be good at playing in the competitive way which is different than normal DBD playstyle, survivors are less risky, less prone to mind games, less likely to go for cheeky plays, majority of the time competitive dbd is less fun to watch than casual because of this. Instead of going for the stun timing they will predrop a pallet because its safe because its not that they may get tunnelled and camped but they will get tunnelled and camped. This is why when you see killer tier list you have nurse, blight and spirit at the top. They all have abilities that allow them to transverse the map quickly, shut down or ignore loops and get downs quickly even if the survivors are playing well. I am not saying other killers aren't used but these killers are generally dictated as the best.

High Skill Ceiling- These killers are often going to be similar to competitive but are good in the casual way as well. More mind gaming, more tricking or mind gaming or predicting the survivor. They are killers where the killers actions have the most impact on the game. Where if the killer plays the survivors correctly they win the game. Look at the killers at the top of the Top 5% MMR. Wesker's dashes can make loops super unsafe if he mind games them right, Plagues red puke can hit blind shots over walls if she predicts where the survivor is going, Dredge with his anti-loop remnant. These killers are good at the fun chasey aspect of DBD. In addition you still have the competitive killers like Nurse, Blight and Spirit near the top

Low skill floor/High RNG- These are the killers good against the casual gamer. Their built in mechanics make it difficult for survivors even if the killer doesn't make the correct choice every time. They are good because of the survivors mistakes not just the killers good judgement, or at least one part of the killer has this aspect. Stealth is also a big part because where at higher levels survivors are more aware of stealth killers the lack of a terror radius is a much bigger deal at mid and low MMRs. Looking at the all MMR highest we have Pinhead, his chain hunt, Sadako, both her tapes and stealth, Wesker, Ouroboros and killer instinct with sprays, Freddy, Dreamrealm obliviousness and dream pallets, Pig, stealth and beartraps, Plague pretty easily making everyone one shotable or going to cleanse, and Dredge with Nighttime possibly being super oppressive if you dont know the map or dont have aura reading perks. Killers that require precision and are punished if they don't have it drop like the nurse (miss a blink in fatigue), hillbilly (bad sprint= lots of distance), blight (bad rush = lots of distance) and trickster (needs consistent aim for 6 knives as opposed to 1 lucky shot).

Youre missing one thing, killers also have quite a lot of bans themselves (depends on which killer as well) in tournaments and are locked to one specific map which can be a good or bad thing. Survivors can also have bans depending on which killer is played (Flashbang against Nurse for example) Also killers being played or not played is dependent on the tournament organizers more than it is the players, as each season has a pool of killers that are allowed to be played . Before a match begins each team has to ban certain killers and more bans come up the more the tourney has progressed.

Also the decisions made by Survivors are absolutely influenced in tournaments and thats because of how the point system works, which is by hook stages. I dont remember the numbers exactly from DbE, but fresh hooks are a big source of points. More often than not were you leaving a fellow Survivor to make 1, or multiple 0 stage Survivors live. You might see them be more risky depending on the situation of not the game, but the round it self, same goes for killers. You might see a killer go for a much more risky but rewarding play because the last round their team played Survivor and didnt do so well, so they need something to try and catch up in points.

"High MMR" and tournaments are 2 completely different games, and really shouldn't be compared

There really isn't, since people go into tourneys with a completely different mindset and ruleset