[quote=@IncredibleBee]
As promised

-Tanya
Trained primarily in melee combat in the first place. She relies on enchanted gear, but presumably still has some skill in fencing.
Her only notable weakness is a lack of strength and constitution, which is why she needs enchantments to lighten a two or three pound bastard sword. She'd need to ditch the plate armor and swap out for a lighter blade (I'd personally suggest a xiphos or seax), but is otherwise functional.

-Sophia
Pretty blatantly has Knowledge: Religion and Knowledge: History, which is good for finding info in certain scenarios.
As a harpy, she can fly, and that naturally gives her an advantage as a scout.

-Leander
Presumably has high ranks in Knowledge: Arcane. I suspect he's also literate and well read, as expected of a scholar. Additionally, undead are typically immune to pain and require special circumstances to be killed, which is a huge advantage in combat.
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So in order: essentially useless because she's trained in a [i]completely different style of combat[/i] to one focusing on using a one-handed short-sword. Whilst unarmoured. With poor reach. And thus dropping drastically behind the other fighters in utility.

Sophia: Also has Knowledge (Planes), but pretty much useless, because there's not much scouting or knowledge work involved in WALKING DOWN A STAIRCASE.

Leander: making assumptions about the immunity of pain is one thing. Missing that you can still die by decapitation, and 'pain resilience' being pretty pointless if you can't do any damage. And knowing things is again useless for walking down a staircase in a straight slogfest. That, and they're alive by magic, so the dungeon would straight up kill 'em.