Plot Hooks.
Legal support, social scenes and teaching. Any plots that have to do with defending the weak from the authorities and supporting those who can't support themselves in the legal terrain got his attention. Smut wise, that has to do with power, control and public display will be for him.
Signature Motif.
Smoking. He will constantly be seen with a cigarette in hand. This is either because it's one of the tools he uses to create magical effects or because he enjoys the taste of tobacco. Being an immortal helps a lot with not developing lung diseases.
Perfect for...
Power play and Teaching. Addison likes to take control, to take the lead and take over. He's a leader and likes to keep it that way on the bed. Also, if you are an inexperienced innocent young man then you probably want to meet him for him to teach you the ways of pleasure.
Goal
Reformation.
Having lived for quite a while, Addison understands that the downfall of the Order of Hermes is all due the inner corruption and intrigue that erodes from the bottom. He witnessed the last days of Doissetep and having survived such ordeals inspire him to train a new generation of collaborative and insightful Mages.
obstacle
Tradition.
Having experienced the intrigues and betrayal of power-hungry Cabals in the past, he understands that Rebellion must come to sweep away the old laws and set a new Codex that can lead and shape the Mages of current times. This is his reason to start training new talents. But old structures are boulders to push.
«Facta Non Praesumutur, Sed Probantur»