Drizzt 

There’s an approach that legendary figures should be better than PCs. My preferred approach is that PCs *are* the legendary figures of their world. Your characters are your World’s versions of Achilles and Lancelot and Robin Hood. PCs are the best in the world, and our own myths and legends should be about on the same level.
How are you measuring "ridiculous stuff"?Ideally I'd like to end up with a smorgasbord of mythical figures and to achieve that Achilles should *not* top out the power scale--that might end up being Beowulf (I think) because he does some really ridiculous stuff.
How are you measuring "ridiculous stuff"?
Beowulf spends a long time underwater. Achilles can call upon the gods to save him from the river Scamander. Those both seem prety good for underwater adventuring (just to focus on one aspect of their exploits).
If we started with Achilles having a Strength of 20, how high does it have to go for Hercules? Thor? I've got a thing already for the more bombastic designs but their playability is nullified by landing outside of the design sweet spot (which is roughly 5th-12th level, depending on tastes).
Don't get me wrong, I love high-level games (I have books all about it!) but to maximize usability builds will ideally land within a CR range appropriate to four-five adventurers nestled in there at mid-level.
Heracles is, by contrast, the great hero of his age. He's clearly as strong as giants and indeed one of his deeds is to hold up the world for a time as well as defeating Antaeus, one of the strongest giants. He's constantly beating the snot out of foes, often by wrestling them and presumably killing them to death.
I cannot give enough XP for this!
I'll do a proper (likely not quite as powerful) Morgan le Fay later but I've got a placeholder until then.
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Maybe Beowulf actually used a Sword of Sharpness (because, y'know, it's about the only thing in D&D that can remove limbs), but left that out of his testimony because said sword was stolen (because, how does a D&D character acquire anything: home-invasion robbery)...Beowulf tears a limb off of Grendel with his bare hands (which is, the internet says, roughly equivalent to 22,500-45,000 pounds of force).
A Greek being statted as a Barbarian would be a tad ironic.Heracles is, by contrast, the great hero of his age. He's clearly as strong as giants and indeed one of his deeds is to hold up the world for a time as well as defeating Antaeus, one of the strongest giants.
I'm not really sure that this is represented very well given the brick wall stat cap.
Heracles definitely feels barbarian to me: He walks around with a giant olive-wood club and is known for being nigh-indestructible, violent rages, and massive feats of strength. and might well have some divine gifts due to his birth.
In D&D, sure. Magic items are the only way (or best/easiest way) to do a lot of things.He's also got a girdle (Girdle of Giant Strength?)