The Super Secret Assassin

About
The Super Secret Assassin is a fairly hard boss, being the third encountered in the game. He spends most of his time invisible, only becoming visible to shoot.

Behavior
Normal Mode: He moves around very frantically while staying invisible, pausing every 200 frames to fire once at the player, and then continues. After doing this 5 times he reveals himself and sends volleys of bullets at the player for 800 frames before resuming his normal behavior. He does this until he is killed.

Hard Mode: He behaves the same, accept when he shoots. Instead of firing one bullet he fires a spread of four bullets.

Strategy
Characters with very high fire rates and long range are good against this boss, such as Blu and Heliotrope. Characters like Redd and Crimson suffer a lot against this boss due to fast movement, making him hard to land shots on. It's best to focus on him when he's stationary. If you're using Crimson, save your attacks for when he stands still to avoid health loss. If you're playing any other character (Heliotrope is the exception) save your specials for when he starts volleying bullets at you. This gives you the highest chance of landing shots.