My june 2021 list, made with the benefit of hindsight and still including some controversial picks. Especially the stuff with Bang, Atomic and Darkshine right now who are all hot topics. Get ready for a bible.
Tier 0 - Competitive with God Level threats (God level)
1. King: Agree with 2019 Zhoniin. His meta-luck-reality-manipulation may not be something we can put on a vswiki profile, but he just can't lose.
2. Blast: Superior to Tatsumaki, who is already high into the dragon or above category and arguably god level in her own right. Faster than Flashy Flash, can travel across dimensions, the HA's last reserve who's ready to take on disaster level God threats. Currently on a crusade against "God", who is obviously going to be the first (and maybe only) God level threat. Blatantly reserved for God level threats.
Tier 1 - Easily defeat All Dragon Level Threats (Above Dragon level)
3. Tatsumaki: Defeated Psykorochi, an entity that could render the planet uninhabitable with a few earth shattering attacks. Would solo the MA if it weren't for being weakened - with God's intervention, judging by the random, not-so-random moon shot. Stated to be able easily lift Z city, which I believe. Would even be competitive with Boros and Awakened Garou- until AG gets a massive buff that clearly establishes he is above here.
4. Metal Knight: Pretty featless right now, but I bet he's got technology superior to Dr. Kuseno, so he could somehow replicate 10 second Genos multi-continental power and probably on greater (or at least more consistent) scale. Has Boros's ship, at least a 100 low 7-B/High 7-C battle drones, stuff that's surely superior to Brave Giant.
4.5 10 second Genos: Okay, so Genos could defeat 99% of all dragon level threats with 10 seconds mode, rare exceptions being a fully split BS covering like a continent or Flashy Flash (maybe). So Genos as a whole should technically be at this level, but I want to try and scale Genos's 10 second and "normal" mode separately. Specially cause I think future Genos upgrades won't be above dragon to the extent 10 second genos is.
Tier 2 - Defeat low and mid dragons, competitive with High Dragons (High Dragon level)
5. Bang: Has fought Rover, EC, Melzalgald and is going to fight a version of Garou that should be somewhat stronger than spiral Garou. Rover and EC are high dragons I would say, current Garou is at least a high dragon. Bang is at least around Darkshine's level, may be higher depending on events in this next chapter.
6. Darkshine: Mid-diff defeated Carnage Mode Kabuto (took 15 minutes but wanted stronger opponents), casually pulverized transformed Bug God, dispersed ENW without too much difficulty, helped Garou to evolve into his current stage, stated by Black Sperm to be able to potentially beat a fully split BS in a battle of attrition (insane). Would tank the atomic slash if the FU fight is any indication.
7. Flashy Flash: One-shot the ninja bros at once and is pretty fast. Would have killed the Garou that fought Darkshine.
8. Atomic Samurai: Apparently has alot of bad match-ups: Black Sperm, ENW, Melzagald, Vomited Fuhrer Ugly... and he keeps getting them. So many bad match-ups actually, that you can make the case he's mid dragon because he loses so many fights. But those grounds for slander aside- he was stated to be able to kill the Garou that Darkshine first fought, sliced up Psykos's beams, can cut lightning. Might actually have a good time against dragons like Rover and Homeless.
9. Drive Knight: Outclassed Nyan in all categories, while also ambiguously stating Nyan would be difficult to defeat in a frontal attack without prep. I would say Drive Knight is normally mid dragon given that, but his performance against Psykos proves to me that he can perform at the high dragon level if he's willing to spend all his energy. (Possibly has a king form that might Above Dragon IDK.)
Tier 3 - Defeat Low dragons, competitive with mid dragons (Mid Dragon level)
10. "normal" Genos: I consider his base and DK to be close in tier, but DK has a few advantages over "normal" Genos that allow him to perform better against high dragons. Not quite as versatile as Drive Knight, did not have quite as impressive of a showing against Psykosjet as Drive Knight either- so I don't think he can push himself to really compete with high dragons without dipping into some of the 10 seconds power.
11. Child Emperor: mid dragon with Brave Giant. Still versatile without it
Tier 4 - Competitive with Low Dragons (Low Dragon level)
12. Puri Puri: PPP was demolishing mid-demons before he got his regen, bristle armor buff and vibration angel buff. Those buffs take him from a high demon level to an ambiguous dragon level, where he can survive a barrage from a bloodlusted mid-dragon Garou and do damage to Psykosjet.
13. Pig God: Pig God has shown himself to be just below Gums's level, he's escaped from his mouth like twice on his own, escaped from Gums, interrupted Gums twice with a tackle. Gums is the least impressive cadre, but a dragon nonetheless. Probably Above Dragon with his secret power.
14. Zombieman: Hasn't show himself to be capable of "defeating Dragons" but can survive attacks from dragons long enough to get stealth victories. In terms of raw power with weapons, he's a mid-demon maybe, but his regen keeps in him in fights with low, mid and even high dragons.
15. Watchdog Man: Beating HHG doesn't make him anything more than an "above demon", but I think Zhoniin is right when he says that Watchdog Man will end up being dragon level via defending Q-city.
16. Metal Bat: Metal Bat is in tier 5 before he gets pumped up, but under the right circumstances he will become strong enough to one-shot HHG and stop EC's charge, both dragon level feats.
Tier 5 - Defeat mid demons, competitive with high demons (high demon)
17. Base Amai Mask: Man, I don't want to slander Amai but Murata clearly hates him. Amai got ripped in two by Fuhrer, seemed comparable in speed to the disciples, took superficial damage from DO-S (a mid-demon imo) and hasn't actually do anything of consequence against a dragon. Webcomic amai was definitely a mid-dragon but manga Amai Mask's stock can only go back up from now. I expect he will be low dragon in base and high dragon in monster form when all is said and done.
18. Tanktop Master: TTM is in a tier of his own, but not in a good way. He lost to HHG and has got a couple good LS feats, but nothing that would guarantee a victory over the weakest dragons, like Bakuzan. The other heroes that were/are kinda in tier 5 have extenuating circumstances like Metal Bat or Watchdog Man or have transcended this tier like PPP.