In person, I'm generally quiet, calm, and thoughtful, very unlikely to get angry, although I do occasionally get into a sort of moody stubborn mode and avoid talking. I get that from my father.
In '05-'07, I was much more serious and a little full of myself (great idea making a 13-year old a player mod, Jagex), in '08-'09 I was much sillier, and my old videos piss myself off (hello Roblox) and with Blockland in '09-'10 I would get so angry at people I was convinced I had multiple personality or bipolar disorder.
More recently, the gap has been closing, thankfully.