Well,rogue from me:http://nwn2db.com/build/?125424
He is STR base through... He is pretty tough to kill, work good with Khelgar. Sneak dise isn't remarkable, but 5d6(5-30 dem) is pretty solid, and he doens't completely lost, when enemy prefer him to tank. Many skill points, bluff and intimidate skills(through you need to threw something out for intimidate). He can talk, he can fight, he can do rogue stuff, he is dangerous in normal fight and still good at attacks from behind. Also no exp penalty and no ECL. And DD also give you emergensy button(useful against bosses)
Main problem that he needed to be lawful and, if you haven't got installed SoZ - member of Shadow thief wich but this PrC on a bit later lvls. Sinse most of "dark path" is chaotic you should be careful in your dialog and maintain the balanse. Second con - it's a dwarf, so no automatic search for you
Wills are also low, but you have a druid and a priest so...
P.S> I used him in companion myself. Now I'm at the final dungeon and he was pretty good all the way here. Difficalty - Harcore DnD. Also I swapped him a bit, taking lore and intimidate
P.P.S. Greatest thing was to beat bard challenge with aggressive words and acrobatic in fullplate with tower shield)