Scratch

I have an awesome game (check out the first two versions of it; it's called Cubist) and I'm making another version. This time it is going to have different enemy types. All enemies should appear on the right side of the screen. I need ideas for new behaviors of enemies (I'll handle all the code.) So far I have:
1. Picks a random y position and moves to the left side of the screen.
2. Sets it's y position to the players and moves to the left side of the screen.
3. Constantly moves toward the player. Can't be dodged!

I need at least five total, 11 maximum. I will give credit.