Monster PC Creation Rules

Rule 1: Ability Score Modifiers
Determine high score modifiers as normal.  For lower scores, do the same as high scores.  Subtract the low ability score from 10 (if even) or from 11 (if odd) and the sum is the negative modifier.

Rule 2: Monster PC’s from Non 1 HD or Less Monsters
The DMG does not recommend allowing having Trolls or Minotaurs as PC’s among lesser level PC’s.  However, with these rules, you should be able to have a level 1 troll or minotaur without completely unbalancing the party.  
	Start a level 1 creature and figure up his ability modifiers as stated above and roll up its stats.  Any non 1HD or less monster must gain enough levels to equal their monster entry’s HD.  For example, a centaur is a 4HD monster as listed in the MM, so a centaur PC must gain 3 monster levels before acquiring a class level.  At level 4, the centaur can begin taking levels in character classes as normal PC’s.  The monster gains feats and skill points as stated by their monster type.  So that same centaur gains 1d8 in hit points, increases attack bonuses as a fighter, gains +2 skill points (plus any Intelligence modifier), increases saves by as normal with the high score going to Reflex and Will, and gains a feat at level 1 plus another every 4 levels after.  Any feats gained must be chosen from feats listed in the monster’s entry.  Skills must be bought from the skills listed in the monster’s entry.  They don’t have to purchase all the skills in the entry, but they cannot acquire any skills not on that list until all those skills are bought.  Additional skills are bought ad if they were cross-class in cost and rank limit by level.  For example, a centaur must take Weapon Focus (hooves) as the first feat he is allowed (as per all monstrous humanoids), and he can choose to purchase only the Hide, Listen, Move Silently, Spot, and Wilderness Lore skills at first at normal cost as if they were skills for their class.  All other skills are considered cross-class.
	Any Special Attack or Special Qualities are gained as normal, which is rather unbalancing, so all monster PC’s are hit with a 10% experience penalty until they reach the point that they can take character class levels.  At that point, they are no longer hit with the experience penalty.
	Though the DM has the final say, any monster entry that states Advancement Range “By character class” could be a PC monster.  Do not choose monsters with Intelligence scores of 3 or below as a PC, since they are not intelligent enough to communicate or comprehend issues on a level close to that of other PC races.