Sorcerer Bloodline database | EN World Tabletop RPG News & Reviews
Seriously though, it sounds like you're leaning away from having your sorcerer's magic be due to some sort of special ancestor. If that's the case, you still have a number of options - there are several bloodline choices that don't rely on someone having been intimate with some sort of monster.
From the PF Core rulebook, there's always the Arcane (if he's just naturally magically inclined) or Destined (he's meant for something greater) bloodlines. Likewise, you can interpret the Elemental bloodline as being more about an affinity for a type of planar energy than having an elemental ancestor.
The Reborn Soul bloodline from the free web enhancement for The Book of Arcane Magic fits if he's a reincarnation of a great spellcaster. Bear in mind that this web enhancement draws on the book, so you'll either need to have the BoAM, or modify the bloodline.
Class Options Vol. 1 is entirely based around the idea of non-ancestor bloodlines. Three of them (Nature, Seer, and Word) are based around having a connection to something diffuse (such as nature itself) or some special sort of magical ability (being a seer, or tapping into the power of the spoken word). The other seven are based around having a close connection to one of the seven deadly sins.
The two bloodlines in Dredan are also based around having a connection to a planar energy - in this case life or death energy. Similarly, the one in the Genius Guide to Ice Magic does the same thing for cold as an energy type.
The Pestilence bloodline in Pathfinder #29 is a rather disgusting source of arcane power, being based around filth and vermin.
Finally, if you want his power to be ancestral in general, rather than having an odd monster in his family history, the Ancestral bloodline in Wayfinder #1 is a good choice.
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