Spirtualist is a fascinating but odd class, I am having a bit of a rough time putting one together.
I feel the same way about them. Really interesting class. The only one I've actually played was inspired by the Shadow Man from Princess and the Frog. Very voodoo inspired. His own shadow was his Phantom.
In the early levels, a combat-oriented Phantom is extremely powerful, but somewhere between 3rd and 5th level they peter off fast. At that point it's better to retrain them into some kind of scout/skill based companion.
Personally, I think the Shadowdancer probably should have been re-worked as a Spiritualist archetype.
It's difficult for a Paladin with Detect Evil at will not to know someone with whom you share some living is Evil.
Lead lined armor
Wand of Undetectable Alignment (50 days worth of no alignment-ness)
Or, in an undead-themed game, the Paladin in question could just agree to take [url=http://www.d20pfsrd.com/classes/core-classes/paladin/archetypes/paizo---paladin-archetypes/oathbound-paladin/oath-against-undeath]Oath Against Undeath[/url (which is actually are a really good trade. Free ghost touch armor is incredible).
There's really no reason this has to turn into a tug of war between alignments. As players, we can work out any kinks that come up.
Here's Doomed Hero's submission. I've yet to finish his equipment but everything else is there.
Zach is an Oracle of Saranrae from a long line of monster-hunters. The Ravencour family is kinda like Golarion's version of the Belmont clan. He's a former soldier of Lastwall with a strong devotion to duty. He rose through the ranks as the medic for a scout unit, so he has sharp eyes, a light step, and a knack for keeping his squad alive.
Due to his damaged hands he's not much good with weapons, but he's compensated by learning how to throw a pretty good punch.
In terms of Party Role, Zach is primarily a support caster, but he can make a good backup for nearly any role. He can move with the scouts, talk along with the party face, fight next to the frontliners, all while burst-healing to keep everyone at full fighting strength.
Zach is designed to be an excellent team player and should be able to fit in with any kind of party makeup.
Please let me know what you think. All the details are in the alias.