I need help designing a character. A mean character.

The kind that can just make a DM stare at you for a bit wondering how the heck you did that.

Normally I can do this myself, but there are a few caveats to this exercise:
- Core only
- No Wizard or Sorcerer
- early level (we are level 3)

Now before half you get up in arms about how I should "talk it out" or whatnot:
- first combat of the campaign was against werewolves (yes we started at level 1)
- our group has collectively downed dragons and whatnot. (we were level 3)
- he had no qualm upping the ante and throwing 53 goblins at us. (waves of 6-8 each turn with 2 goblin dogs per wave. No they are not stupid like goblins should be)