the neutral chars of bgII are
Jaheira,
Jan,
Cernd,
hear'dalis
and yoshimo
this party fits your fmt very well, since it is often played like a fighter with buffing magic, who starts with a BS
imho you do not need yoshimo and could switch him for an bonus mage
i often end up by adding edwin or arie but you could also leave this spot free to add npc which you need for some quests ( Valygar, planetar sphere etc.)
and your pc would level a bit faster which could be a relief since you tripple classed
