Hmm... now that is an esoteric question.
If I were a D&D deity...
Patron of the helpless, the wronged without cause, the persecuted, revolutionairies, idealists, and of rage against injustice in high places. Favors anyone who takes up these causes, especially when doing so is to of no direct benifit to themselves.
Responcible for inciting righteous anger (the thunder) and cooling unjust or untimely rage (and the rain).
Alignment: NG
Domains:
Storm
Knowledge
Good
Travel
Portfolio Sence: Is aware of all acts that are began in anger, and retains this sensation for 15 weeks afterwards.
Symbol: The Stormcloud
Holy Days: Nights of the New Moon, especially those in Autumn, especially on nights with thunderstorms.
Worshiped anywhere that water meets land violently: thunderstorms, rapids, waterfalls, ocean strands particularly those with large waves.