Based on own experiance and fun of playing i have the following top ten
1: Sorcerer - Once you know what spells to choise a Sorcerer is so much more useful then an ordenairy mage.. It just needs more practice and understanding
2: Necromancer and Conjurer - Because in my opinion the Illution and Divination spells in BG2 are the weakest schools
3: Bezerker/Mage -because you can wear braches and a Kensai Mage can't
4: Cleric Mage - Incase you wanna be able to cast everything and have armor too
5: Beastmaster - he's no so much super as a character but it's great for roll playing and getting to know which staves are good and to use the Ranger Steath.
6: Assassin Because you get to incredible levels anyway you have enough point to throw into the more important skills. (Stealth, Lock picking and Detecting)
7: Cavelier
8: Fighter/Thief
9: Blade
10: Priest of Helm
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