I have managed to convince Fenris that magic isn't all bad and I've managed to convince Anders that the Chantry isn't all bad. Through some miracle I am in the situation of being able to choose whether to romance Anders or Fenris. Sebastian, Aveline, Isabella, Varric, Merrill, Anders and Fenris - they all like me to varying degrees. I have, through judicious character roleplaying, managed to get my mage character in a situation where everyone is friends with him.