So does "Silver Symbiosis" interest you?
If you haven't read up on the game yet, it is a single-player RPG.
Main objective: To seal Satan back in Hell where he belongs!
Primary weapons: Psion-Sword, Psion-Shield, and Psion-Tether
Secondary weapons: Whatever ranged weaponry you can acquire
Basically you play as a teenager, either Evan or his twin sister Aina. The one you choose encounters a symbiote that bonds with them and grants them a plethora of abilities. The Psionics are the most obvious aspect of this. The other ability is that of fusing temporarily with other creatures and permanentally gaining powers from that fusion. You must battle the evil that comes through some of the rifts, befriend the good that comes through others, and NOT get the two mixed up! Mixing them up gets the good killed and/or you killed.
You also gain the ability to fuse up to 3 of the Fusion abilities together to create new abilities, the only requirement is that the powers being combined came from different creatures.
The rifts that are opening are connecting Earth to various other realities, including Heaven and Hell. Heaven has sent an Angel through to help you defeat the demons being sent from Hell. The final boss is Satan himself who comes in the form he had before being banished from Heaven, and is under the glow of false glory. Don't be fooled!
Oh yeah, the Angel only helps you directly in one boss battle and even that is conditional on you detroying the Demonic Seals which keep him out of that dungeon, after that(provided you destroyed the Seals) he grants you an ability which alows you to deal double damage to demons.
The only actual companion character is the Rock Goblin Champion, AFTER you defeat him. Attacking any of his people(after he joins you) permanently loses you his help.
