<Snipped quote by IncredibleBee>
So in order: essentially useless because she's trained in a completely different style of combat 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.
Actually it says Tanya is trained in "one-handed swords" so I'd assume that would include the xiphos. Her low strength means she's rather limited in options, so I'd assumed she'd have to learn with some kind of mundane weapon until she was granted the enchanted bastard sword.
Also pain immunity and special circumstances for death is useful as hell. You can draw aggro like crazy while the DPS guys get to work. That's why Berserkers and Barbarians usually get pain resistance and tons of temporary HP.
Also, lore checks are probably one of the more useful skills outside of combat, since they're useful for following leads and quest threads. Even inside combat, they can be used to identify monsters and their weaknesses.