I'm playing my first game as England on m/m and the Danes appear to be the faction with the most diverse units so far. Huscarls, Norse Swordsmen, Axe wielding maniacs (not sure about that one), psychotic heavy clergy cavalry, etc... Remind me of all those scandinavians I met travelling (something to do with with expensive beer at home).

They are also very aggressive in my game as well. Right now they are attacking Antwerp and have just about wiped out the HRE. Luckily the Pope is my poodle and excommunicated the crazed scandinavians. So I launched a couple of crusades against them which haws seriously cramped their style.