John Homelander, fictions greatest L Taker, and his many MANY Ls. I believe this qualifies as a megapost as this is every L of Homelander were celebrating.

That being said, here's how we're doing this: We're going counter clockwise starting from the top left of each slide, listing each Character and giving the brief frequenting of why they beat Homelander. 

First let's go over Homelanders scaling: Homelander Consistently gets into the Large Town-Small city level ranges of power and durability, while his speed should be In the Hypersonic+ range. Now, you could get him into the Large City to possibly mountain level range with highball statements, if you squint you could argue Relativistic speed, and there is a country level outlier... but after that finale? You'd be hard-pressed to convince me this guy could even survive a high-end nuke.

SLIDE 1

He-Man (Masters of the Universe): Guy has pushed moons casually.

Batman (DC): Is Batman

Super Scott (Hero inside): One shot a city level threat and Upscales Country level heroes. Also survived being hit with the power of 100 of his own punches

Chara (Undertale): Should be faster (outsped Meteors and Timeline erasure), can attack the soul, and reset the timeline until she wins (honestly it probably wouldn't even come down to that)

Master Chief (Halo): The cooler John. Anti-matter weaponry, better BIQ, better speed, better bitches, and WAY more fighting experience.

Sans (Undertale): Soul attacks, Teleportation, Telekinesis, and upscales Charas speed.

Aquaman (Super Friends): Upscales town level threats, and is massively faster than even Homelanders high ends

Gamma Jack (Incredibles): Upscales Hypershock who's mountain level, and should upscale Elastigirl who kept up with Mr. Incredible, who dodged Lasers point blank. (Mind you, this guy isn't even a living character in the movie)

Static (DC/Dakotaverse): Played Tug of war with Superboy and Is BARE MINIMUM lightning speed. Also has Better Hax and Theme Song.

SLIDE 2

Omni-man (Invincible): There's a whole episode on this.

Sentry (Marvel Cinematic Universe): Compared to Thor who can survive a Country-Continental level heat from a star, and should massively upscale MCU Spider-Man who dodged lightning

Injustice Superman (DC Elseworld): Threatened to destroy Apokolips in his fight with Darkseid, and flew to Apokolips in less than a few hours 

Hancock (...): Flew to the moon and fragmented it to a continental yield within only a few hours.

Superboy (DC): Even if Superboy was hypothetically only equal to 1% of the power of Superman, that's still closer to Superman than Homelander, Omni-man or Hancock are at. 

Supergirl (CW): Surprisingly she actually has similar Durability Scaling to Homelander... unfortunately for Homelander, she's somewhat relative to Flash in speed, who has FTL+ scaling

Gladiator (Marvel): Dude fought Hyperion in Nanoseconds and contained a blast that would've wiped out half the solar system

Tighten (Megamind): Dude has all the powers of Metro Man

Plutonian (Irredeemable): Can no sell star level attacks and easily outspeed radio waves

Man, these Superman clones are whooping his ass, would be a shame if-

SLIDE 3

Superman (Cavill/DCEU): Upscales Planet destroying weaponry like the World engine and mother Boxes

Superman (Tom Welling/Smallville): Pushed a planet away

Superman (Jack Quaid/MAWS): 

The Many, many, many, many, (So incredibly many) many, many, many, many, many, many, (So incredibly many) many, many, many Ls of Homelander