How do you make a damn Ninja Mage?

*Put most of all points into Intelligence.
*I only put about 40?-42? pts into Strength to be able to wear some specific set gear that gives +3SP regen (I forget the set's name as its been a long time since I've played SSII).
*Put some pts into Vitality, but you really can't afford to put points into anything much but INT for a long time. So when you level up for pretty much every level, pretty much all points go into INT.
*Get gear that has SP regen or +SP pts.
*Put all points into Debris. (no brainer there)
*Put all points into that skill that when you get hit, you dissappear for a second (invisibility) (I forget the skills name, sorry). This skill helps the mage live on when surrounded by multiple enemies.
*And that's about it.
*Oh, and your going to be sucking up major SP for most of the game. Around level 60-70, your mage ninja will start to own, and won't be using SP potions as much, nor will he be going back to town all the time to recharge/restock-on-SP-potions. So, as always, buy SP potions and be ready to go back to town frequently.

*Also, try to get multiple foes around you for the most efficiency when using the skill Debris.

I will start a Ninja Mage today!
My Sword-Ninja is lvl 127 right now, and its time to try something new.

Will try your guide for leveling up, and will see if I can ad anything.