No answer will be as cool as that pic. Shame about the resolution.
But, people who have in Marvel ignoring the Odin tier and above as well as tech:
Surfer, Thor (with Gorr), Hulk (With Red She Hulk), Thanos (With Drax), Drax (planetoids and a small sun), Terrax, Firelord, Nova (well, she busted a sun), Champion, Gladiator, Mephisto (With Galactus), Morg (with Surfer), Dr Strange (By core exploding), Genis and Sentry together apparently, Beta Ray Bill, Hyperion (Exploded a sun), Necrom, Stardust, Buckethead Nova, Fallen One, Adam Warlock destroyed a timeline, Binary Ms Marvel, Talon (Darkhawk armor), Seth, and Captain Britain was destroying the Starlight Citadel which was said was big enough to fit planets in it in his battle with Fury.
I think that's about it for that level. Though you could certainly fill it up if you included people on Odin's level and above.
I'd have to think about a DC one though. I believe Superman and Zod were destroying a planet under the red sun, Superboy Prime, PC Hal, PC Superman, Sun Eaters, Lobo's weaponry, Barry's destroyed timelines, John Stewart on Mogo, Volthoom, Sinestro
Well, I just re-read Kingbreaker and the Hodinn was going around blowing up planets. Also I forgot Quabri, and New Son Gambit. As well as Magus ripping a star in half. And the Alephs under the Builders.
Darkseid as well.
I'll bump this if I think of more around that level.
True. It was just a solar flare. I'm not sure why I thought it was destroyed. Probably because I didn't check the issue when I said that. Just some distant memory.
Same with Firelord from the Heroes Reborn universe destroying a planet. That was just a dissipating illusion.
As is the Superman/Zod fight. Destroyed because of the link. What Carver said... ugh.
But yeah, that's what you get for not looking yourself. Every other example is legit though. Though I don't remember reading the issue with Buckethead Nova doing it, so I can't confirm it for sure.
Full planets. Shrinking something doesn't reduce its mass. The fact that Superman was even able to move in a field of infinite gravity because of Joker's manipulations and smash a planet is lulzworthy.
Anyways... I'm surprised you're not using the fight b/n Kal-El and Kal-L during infinite crisis. You know... The one where the force of their blows are indirectly destroying multiple earths. (please log in to view the image)
Anyway, can we limit this to non disputable examples? I'm really curious about other examples since I can't think of too many others. Captain Atom, but he was severely amped seemingly past the limit I'm imposing on my own examples.
I think a true world breaker is one who can do it solo and directly. bran posted examples of some doing it indirectly (getting the planet or star to destroy itself by creating an instability inside the core). Also, I don't believe ramming into one from light years away at faster than light speeds count either since that's really a durability feat and not practical of a real fight. In other words, BRB doesn't have planet destroying power in a real battle.
WBH, Surfer, Gladiator, terrax, sentry, genis are obvious Marvel choices.
Superman has feats that are beyond planet destroying. It takes less than one Earth weight of force to destroy a planet. Superman has feats beyond 50 earth weights of force. So in reality, he too has world breaker power.