My favourite is Ragnar... Financial makes your economy quite easy to handle, without as much micro-management and planning as it often entails. Aggressive is just plain fun-- strong troops with lots of promotion paths, are fun to me. And of course this is why I love the UB... A fast navy on a water map leads to some very exciting intercontinental warfare and again gives my ships more choices in terms of promotions. The only way they could make Ragnar better would be to make him charismatic instead of aggressive, but that would probably be overpowered.