Taking a quick dive into export_descr_character_traits, I see the following:
Disciplinarian Trait
Brave Trait
Energetic Trait
Rhetoric Trait (lvl 3 up from lvl 2 decreases from +2 to -1)
PoliticalSkill Trait
RabbleRouser Trait
VictorVirtue Trait
DeceiverVirtue Trait
Authoritarian Trait
BattleScarred Trait
Handsome Trait
Pragmatic Trait
Prim
BattleDread
BattleChivalry
StrategyDread
StrategyChivalry
FactionKiller
GoodDiplomacy
TourneyKnight
HorseRacer
and so on.... Sorry I'm tired.Some of these come with negative other traits as well, but at a glance many of these can be done through battle. It'd seem that TinCow's advice is best. I didn't look at any of the triggers but I am pretty sure most of the good ones are battle/victory related.
Good luck!
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