Somebody who can't get enough of being outside in the wind (and rain).
Moods are changeable.
Once in a while - when unloading an Alpha Strike - gets on a major rant and is very focused.
Might buy an XL cape and build a pair of roller skates (or ice skates in winter) during the campaign, and blow himself in for a dramatic entrance.
Could invoke the words used to describe a tornado / hurricane, when threatening evil-doers with the coming wrath.
Enjoys sensations and feelings, so "(Darling I don't know why) I go to extremes" by Billy Joel is his theme song.
Would love roller coasters and thrill rides, if they have been invented in your world. Wants to experience whitewater rafting and go over Niagara Falls in a barrel.