Guybrush immediately came to mind but yeah, I can see the argument that he might not be indisputably "good" enough.

I want to say Bobbin Threadbare, but it always feels like I dreamed that game because no one else knows it, so probably doesn't qualify for being "loved by fans." Ben from Full Throttle is also probably still too obscure.

Does Indiana Jones' non adventure game fame count? I loved the Last Crusade adventure game.