BG series NWN II
Jaheira Elanee -> both are druids, hard-to-please and headstrong
Kagain/Yeslick/Korgan (take your pick) Khelgar -> fighter dwarves, need I say more?
Imoen Neeshka -> naïve, childish thieves both
Edwin Sand -> “I am sooo wise” / “better than you” attitude
Aerie Qara -> childish, powerful spellcasters
Keldorn/Ajantis Casavir -> paladins, although the annoyance factor might make Casavir parallel to Anomen
Sarevok Bishop -> dark, evil type guy
Jan Jansen Grobnar -> gnome wizards, although Grobnar has none of Jan’s charm
Ammon Jerro and Zhjaeve have no parallel characters in the BG series.
Addendum: MotB expansion pack
BG series MotB
Haer’dalis Gann -> blue hair, nicknames, storytelling
Montaron One-of-Many -> evil thieves (although this one is a bit far-fetched, One-of-Many being a really original character)
Edwin/Aerie Safiya -> Red Wizard; female spellcaster
Mazzy/Aerie Kaelyn -> saintly, cleric woman
Okku, obviously, has no parallel BG character.