Hammerhead
Explorer
I personally never take away any experience from my players; we play to have fun, after all. However, I have given one player the authority to take away experience from anyone else as a joke, since he always tries to get everyone else to stop giving me ideas. Another system of punishment we use exclusively on one player who is an incorrigible punster is to tell him offensive jokes.
I tend to give bonus XP for great roleplaying, although it depends on the character. One player plays a shy and withdrawn half-orc, so he tends to get bonus XP for not saying much. Astoundingly clever plans tends to give the entire group bonus XP, unless said plan was the primary creation of one player. I have gotten some complaints from one player because certain adventures and sessions may focus on the backstory of one character more than the other, and this player argues that since he has less attention on his backstory he gets less roleplaying XP.
I tend to give bonus XP for great roleplaying, although it depends on the character. One player plays a shy and withdrawn half-orc, so he tends to get bonus XP for not saying much. Astoundingly clever plans tends to give the entire group bonus XP, unless said plan was the primary creation of one player. I have gotten some complaints from one player because certain adventures and sessions may focus on the backstory of one character more than the other, and this player argues that since he has less attention on his backstory he gets less roleplaying XP.