This is Kophia. You're fighting him because you felt like it. Note: Use nightmare mode at your own risk. Phase 4 is now guaranteed rather than a 20% chance to ensure Phase 5. Controls: Singleplayer: Wasd, arrow keys, or mobile buttons to move Space or mobile space button to shoot Multiplayer: Wasd to move P1 Arrow keys to move P2 Space to shoot for P1 L to shoot for P2 (Note: Multiplayer and mobile controls cannot be activated at the same time.) Tips: -If you're new, start with easy mode to get used to the attacks. -The rules about when you can shoot Kophia are pretty weird. Turning on the shoot indicator can help with that.
GTA V Wiki for rocket launcher images (the thing that comes out of his sleeve in phs1/atk1 and phs4/atk1). Toby Fox for menu music. Toby Fox for phase 1 music. Hey_Dedu on YT for phase 2 music. Toby Fox for phase 3 music. (I don't remember where I got the music for phase 4, but it's a remix of the phase 1 music) Phase 5 attacks inspired by Undertale amalgamates @knowitall1237 for Phase 5 music.
