Took him down. Final levels were Nel (Level 60), Roger (Level 50) and Sophia (Level 50). Used Normal Attack-> Shadow Wave-> Mirror Slice whenever he used Laser Beams. (The other two characters died, however...)
Got the Sophia Ending.
(Fellpool!!=3) Whenever I see the ending, I get all teary-eyed, no matter how many times I beat the game.
Now that the Level Limit is off, for now, I'll go level up with the Biochimera.