Fauchard1520
Adventurer
"Heroic fantasy" never entirely worked for me because PCs are almost universally goofballs.
That's the issue in a nutshell. It seems like you can either let them get it out of their system and then steer the campaign towards a more serious tone (see also slappy), or you can just join the fun and go the Xykon route. Weighing the pros and cons of the approaches is where I'm at right now.