Inspired by an earlier thread on NPCs in Infinity Explorer, I went into an old save game of BGII and successfully created some old BGI NPCs and got them in my party using the CLUAConsole CreateCreature command.
KIVAN: Only level 2 though, but has his old portrait, unlike the others you can create this way
QUAYLE: Multi-class Cleric Lvl 6 Illusionist Lvl 5
GARRICK: Level 6 Bard
XZAR: (possibly the best catch) LEVEL 13!! Necromancer EQUIPPED with robe of the Evil Archmagi, which he doesn't have in the game if you kill him!
I tried quite a few, and these were the only ones I had any success with so far. Only Kivan has a portrait, but they all have exp points and so therefore I assume they level as normal.
I'm off to try some more....
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Time is an illusion. Lunchtime doubly so.