I have this Brawler and I'm thinking about a dip in bloodrager. I could use some help in picking a bloodline, and especially in tying it in with his background and the Pathfinder world.
As said, Cornil is a brawler, with the mutagenic mauler archetype. The story is that his Sczarni brothers have an alchemical lab, and they're working on assembling a powerful concoction. They've asked Cornil to join the Pathfinder Society to "scout out good business opportunities". In truth, they're using him as a guinea pig to judge the effects of the concoction under various conditions. I've had the idea that the mutagen has some 'otherwordly' element, but I haven't yet had to detail this any further. The bloodrager dip is the perfect opportunity to do so. The bloodline power that I choose for the bloodrager should reflect that 'otherwordly' element that's part of the concoction. His rage ability shows that he is not fully in control any longer; occasionaly the powers of the mutagen manifest, even without him drinking it (possibly due to a trigger that's in line with the origin of those powers?). That's where I could use some help. I've narrowed it down to three broad choices:
Infernal
It's easy to see the blood of a devil being added to the mix. Cornil could be infested with a devil's attitude occasionaly, flying off the handle and letting his 'inner demon' out. It's classic, but also a bit boring. Maybe picking a specific devil could add some flair? On the mechanics side, the 1st-level bloodline power is nice (flaming weapons), but it's only 3 rounds per day.
Celestial
Quite the opposite of the above. There's something creepy to the fact that his Sczarni brothers have an celestial being tied up somewhere, tapping its essence for use in an elixir. The mechanical benefit of this bloodline also seems quite powerful, especially for only a 1-level dip. What I'm not so sure about is the rage, and why the mutagen would inhibit his intelligence. Any ideas what kind of angel/azata/other celestial being could be the donor? Is there anything with a rage-like ability, or with a low-ish intelligence?
Elemental
Mechanically similar to the infernal bloodline, with a bit more choice on what type of damage I'd like to do. Having a tie-in to one of the elements might fit in nicely with the coming season of PFS. It's also logical for a fire elemental to fly into a rage, or perhaps an earth elemental bloodline to go into 'hulk'-mode.
What do you think? Any attractive options I've missed? Any creature in particular that would work well, with that I have in mind?