Here are some ideas, but it kinda depends how you want to use them... Do you play vanilla HQ or do you have levels, new equipment, skills etc...
Fimm - Warriors (Standard HQ fimirs) - Move 6, Attack 3, Defend 3, Body 2, Mind 3
Fianna Fimm - Elite warriors - Move 8, Attack 5, Defend 5, Body 4, Mind 3
+ After attacking, all adjacent heroes/mercenaries is hit by an extra undefendable tail-attack of 1 attack die.(Are the nobles in reality fienna fimms?)Diarch - Demon feinds (wizards and demon worshippers) - Move 6, Attack 3, Defend 3, Body 5, Mind 5
+ Grants all types of fimirs in same room/corridor +1 Attack while aliveIf you want they could summon demons instead. If not killed within 3 rounds after being discovered they summon x-demon.
Meargh - witch-hags (leaders and only females) - Move 6, Attack 3, Defend 6, Body 8, Mind 6
+ 6 chaos spellsFimirs use lots of slaves and kidnap human women for breeding (fraggle yeah!). This is obvious to use in fimir-centric quests.
A rescue mission like sir Ragnar. Free the kidnapped villagers.
Or you could meet slaves halfway through the quest - Anyone got a key?
Or maybe even make some loyal slaves who attack the heroes!
Oh! And you GOT to make a fimir slave-whipper!
Also you will find this thread very inspirational!
http://www.warseer.com/forums/showthrea ... -of-AlbionWarhammer fimir army using mainly converted warhammer plastic savage orcs.