I have a to-do list where I type every idea I have so I don't forget it. I'll copy and paste what I have of the new enemies here:

SHADOW MARIO BATTLE:

- Paints portals of enemies from other battles like tanoombas

- Paints an "M" that makes Mario slip when he tries to do a near attack and he can slide on after the jump attack. He can't make another one if one exists

- Changes into a blue paint orb that moves to the top of the screen. At a random point, he'll change back and pound the ground with his brush, making 2 big red splotches of paint glide across the screen on the sides of him

- Makes Strollin' Stus of various sizes for Mario to jump on and spawn paint balls that Mario jumps to like blocks. The paint balls combine to make a giant paint ball and a trampoline spawns so Mario can jump up and hit the paint ball like a volleyball towards Shadow Mario with a timed Z press

- NABBIT BATTLE:

- HE WILL RUN AWAY WHEN THE MUSIC ENDS WHEN IT'S HIS TURN

- BUZZY BEETLE BACK AND FORTH, MAKE WARIO BASH DURING DODGING STATE

- INVINCIBLE STAR FROM THE MEMORY BATTLE IN BiS. HE FOLLOWS THE COINS

- PETEY BATTLE:

- SOMETIMES PETEY WILL GO UNDERGROUND. THROWING A BOMB UPWARD WILL DEAL MASSIVE DAMAGE SINCE HE'LL EAT THE BOMB. BOWLING THE BOMB WILL STILL DEAL REGULAR DAMAGE, BUT REGULAR THROWN BOMBS WILL MISS

- HE SHOOTS MUD AT YOU SO THAT YOUR JUMPS ARE SLOWER

- SHADOW BATTLE:

- CHAOS SPEAR

- BOTH SONIC AND SHADOW RUN AT EACH OTHER HEAD FIRST: PRESSING Z LOTS WILL MOVE SHADOW BACK

- SHADOW TELEPORTS SONIC IN A RANDOM SPOT AND CHARGES TOWARDS HIM

- (PHASE TWO ONLY) SHADOW TELEPORTS BEHIND SONIC AND KICKS UPWARDS. IF HIT, SONIC WILL GET KICKED INTO THE AIR AND SHADOW WILL TELEPORT UP AND KICK HIM DOWN

Fun fact: This to-do list is very sloppy lol