Speedrunner Distortion2 is arguably the king of wild Elden Ring runs, at least so far. He currently holds the record for the second-fastest speedrun of the game in the "any-percent unrestricted" category. It took him all of seven minutes. Obviously, this time relies heavily on glitches, such as "wrong-warps." Check out his channel here.
Distortion2 didn't stop there, though. He beat every major boss in the game with only Mario-style butt stomps. Though the attack is slow and cumbersome, it deals significant damage. The later bosses were still pretty hard, though.
More recently, Distortion2 has taken it even further by beating every major boss in the game with a lightning roll attack. This skill deals a lot of damage if you manage to roll into a target multiple times, but it also leaves you very vulnerable. That said, Distortion2 was able to stun-lock a surprising number of bosses with it.
YouTuber Plateau Peak managed to beat all the major bosses in the game by using only shields — both to attack and defend. Yes, though the game lets you attack with shields, they do absolutely piddling damage, which means that every boss takes forever to beat. Check out his channel here.
OG FromSoftware YouTuber LobosJr completed a run of the game where he "cheesed" as many of the bosses as possible. Check out his channel here.
The cheap strategies that he utilized include: deactivating a boss's AI, luring bosses to jump off of cliffs, and simply pelting a boss with ranged attacks from afar. All made possible by glitches and design oversights.
Popular Souls YouTuber Iron Pineapple managed to battle his way to the Elden Throne without attacking once — a true "pacifist run." Check out his channel here.