Thanks for the info, Kckolbe.
I was considering making a human Summoner with the Synthesist archetype.
The basic background as far as I've figured out for her is that she's a descendant of a great hero, a valiant and courageous Paladin who lived many centuries ago and was tasked by the crown to guard an expedition to the north of the region to establish a frontier town along with a small contingient of soldiers. For the first few years while the town was being constructed things were mostly fine, with the odd gnoll raid beaten back by the town guards and the ancestor. Fast forward a decade or two and the settlement is thriving, a jewel amidst the wilderness, with the gnolls having been quiet for quite some time. In truth, they were martialling their forces so that they may overwhelm the town's protectors and take the villagers as slaves or meat, even use the settlement itself as a stepping stone on their way further south into the heart of the kingdom.
Basically she was a combination of Joan of Arc and Leonidus. The horde was defeated, but at the cost of her life. Not a single civilian was harmed due to the acts of her and her comrades, and eventually she was considered a saint, a shrine raised for her in the town as it grew and expanded.
Present day, her descendant is able to call upon the spirit of her valiant ancestor to take over her body, changing it into her form from when she was alive (I have yet to decide if the whole "Eidolons can't wear armor" thing means she'll be nude, or if she'll always have her armor due to the natural armor they get). While wearing the skin of her ancestor, the Summoner's mind would likely take a back seat, channelled by the Eidolon to manifest spells and such when required as she doesn't want another of her bloodline to see the horrors of combat.
Then again, I'd also considered applying as part of the Staff with a Mysterious Stranger archetype Gunslinger... Maybe a Kensai/Bladebound Magus (no need for armor.
So many choices! Not only as far as Pathfinder stuff goes but also guild positions.
Actually, would you rather have an adventurer or staff application at this point?