Thread:MMYP999/@comment-27109830-20170108112112/@comment-27416494-20170108181315

This is admittedly going off my limited knowledge of Xenosaga, though I have been interested in this one for a while.

Two blue-haired protagonists (or at least secondary protagonist in KOS-MOS's case) originating from two spacefaring JRPGs on the PS2 who were born/created with the express purpose of protecting humanity from a mysterious race of creatures hellbent on destroying the galaxy. Although it's normally impossible to inflict damage on these beings with conventional weaponry due to their extra-dimensional status, Fayt and KOS-MOS possess special abilities (the power of Destruction and the Hilbert Effect to be specific) that allow the party to fight on even ground with them.

Both games involved delve into a large amount of confusing plot twists (Star Ocean 3 in particular is known for having one of the most absurd plot twists in video game history) and religious references from this point, but I don't much else to think of at this point.