I really like your animation for Rabbid, however if I may nitpick, I have to say that this guy looks too serious! Rabbids are, at least commonly, pretty stupid and really crazy! They cause conflict primarily because they don't know much better. If Rabbid is to be in a fighting stance, he should have more of a happy, playful stance.

I won't go too in-depth here, but I will give some small references that may not be obvious

LP and LK- Simple punches and kicks with his little limbs

MP- Rabbid takes a toilet plunger and swings it from high to low. This is in reference to the Rabbids' first attack from the Nick Flash game, Super Brawl 3: Good vs Evil. (now that's a deep cut! I had to check that myself!)

HP - Rabbid takes a tennis racket that he "found" and swings it at the foe, underhand style. He advances slightly as he swings. This references his second punch attack from SB3.

MK - Rabbid can use a traffic cone to poke at the opponent. Cones are often associated with the Rabbids, so it is a fitting attack.

HK - The silly Rabbid flops onto the ground. This move hits overhead, but is relatively slow to come out. After a LP MP combo is blocked, try cating a crouching blocked opponent with the flop! This move is also a reference to SB3, this time to his third punch attack.

c.(crouching)LP - A swipe with his paw

c.MP - Rabbid nods his head, attacking the oppoent with his ears

c.HP - Traditionally, this is a launching move. The Rabbid arms himself with the Boomshot, a short range arm cannon that Rabbid Mario used in Mario + Rabbids. Rabbid will swing his arm up for the first hit, bringing the opponent in, then he fires the Boomshoot, blasting the target upwards.

c.LK and c.MK - Simple crouching kicks.

c.HK - Rabbid slides at the opponent with his foot out. Think Cloud's down tilt in Smash. on contact, the target trips over, falling behind Rabbid. This is in reference to how in Mario + Rabbids, you can do damage while moving by sliding into enemies.

j.(jumping)LP - Rabbid takes a toilet cleaner (the one with the hairs on it) and sticks it downwards below him. This references the Rabbids' jumping punch attack in SB3.

j.MP- Rabbid uses the toilet plunger to poke at the opponent at a slight downward angle.

j.HP - Rabbid uses the Boomshot to blast the opponent back down to earth. Rabbid's momentum may be shifted a bit back and up due to the blast.

j.LK -A little kick with his foot

j.MK- Rabbid does a frontward flip, using his feet to kick the opponent downwards slightly. This references The Rabbids' second kick in SB3; in that game, the Rabbids fought by being on top of each other, and in this attack, the bottom Rabbid would spin the other two around.

j.HK- Rabbid sticks his arms and legs out for a belly flop. He would  have that happy, crazy expression that Rabbids are known for doing.

Grab - Rabbid pulls out a Helicon(witch is kinda like a tuba), and slams it into the opponent, trapping them inside. He would then blow the Helicon, launching the foe out of it. This references the Collector Rabbid from Rabbids Go Home, who stored the stuff you collected by stuffing it into his aforementioned instrument.

Plunger Toss - Just like you described, but to make it a more unique projectile, I would make it be thrown in a slight arc. Strength indicates the speed of the attack.

BWAH! - Rabbids love to scream!  It was even their main attack in Rabbids Go Home. Rabbid can make reference to this in this attack. Rabbid can give a hearty shout, sending a short ranged sound wave right in front of him. This move can nullify projectiles with the shout, and the properties of the move depend on the strength of the move:

• Light is a quick shout that pushes the foe back on hit or block.
• Mid is a slower to come out, but has long hit stun, perfect for a combo (though you shouldn't be able to stun them forever.)
• Heavy is the slowest, but also the strongest, knocking the opponent far away. This Scream also doesn't just block projectiles; it can send a large, unblockable wave at the opponent when hit with a projectile, knocking them down and more or less reflecting the attack.

Pepper Breath - Another reference to SB3, Pepper Breath was their special move in the game. For MUGEN, Rabbid would quickly eat a red pepper, and he will breath a ball of fire for a short range, multi-hit attack. The strength indicates the angle he breaths the flames, though the start up animation is alike for each:

• Light is aimed forward
• Mid is aimed downward for an overhead attack
• Heavy is aimed up for an anti-air attack

Junk Drop - An areal attack with probably the same input as plunger toss. The Rabbid throws a random object downwards, the strength indicating the steepness of the angle he throws it. Though the objects he chucks are random, and have different visual effects when they hit the opponent, all the objects do the same damage and have the same hitbox, making differences purely cosmetic. the following are examples of things he can throw:

• A Caesar Salad from Raving Rabbids: Travel in Time
• A Soda can from Rabbids Crazy Rush
• A Wii U Game Pad from Rabbids Land
• A Traffic Cone
• A Doll from Rabbids Go Home
• A Dog from Rabbids Go Home
• A Capri-Sun Pouch from Rabbids Go Home
• A Coin from Mario + Rabbids
• A Plum from Rayman

The Rabbid may throw more things that reference other MUGEN characters, such as Mario's hat, Link's Sword, or Edd's Lucky Can, implying that he stole the objects from these characters. This move was inspired (yet again) from Rabbids Go Home, and how the game was about gathering a whole lot of stuff.

Rabbids Invasion - Named after the animated show. Rabbid blows into a horn made of pipes (also from Go Home), signaling a whole army of Rabbids to come from behind, running and jumping into the opponent. Think of Strider's Legion Hyper move. The move is weak compared with Rabbid's other Hypers,, but is tough to avoid.  This move references the move from SB3 that the Rabbid Fan can execute when you have a full meter.

Respect the Pouch - For some reason, Rabbids Go Home has a lot of promotions for Capri-Sun drinks! And we all know what happens to those who don't respect the pouch! For this attack, Rabbid will pull out a Capri-Sun, then slam it on the ground like a psyco. As punishment for disrespecting the pouch, The Rabbid's head becomes a swordfish! He then uses his new sword face to slash at the opponent with a combo, before it wears off. This is inspired by a scene from Go Home.

BWAH-ket Launcher! - A Level 3 attack! Rabbid pulls out the Rocket Weapon that Rabbid Luigi uses in Mario + Rabbids. Rabbid then fires the rocket, doing BIG damage on anyone unlucky for it to be in its path. Holding up during the start up aims the Rocket upwards. to anti air opponents.

- Rabbid looks at the screen, screaming with his eyes turning red. This is common for Rabbids to do, especally in earlyer games.
- The Rabbid runs up to the oppoent, picks them up, and runs off screen. This refferences what Rabbids do to XL Stuff in Rabbids Go Home. (I've seen Psychopath Kyo kick Ko'd people offscreen, so I'm sure it's possible.)

These Ideas assume that there is color separation

• Default
• Pants Rabbid - Rabbids Go Home
• Red Underwear - Rabbid Go Home
• Mario Rabbid - Mario + Rabbids
• Luigi Rabbid - Mario + Rabbids
• Rabbid Drone - Rabbids Invasion
• Rabbidstein Monster - Rabbids Invasion
• Bugs Bunny - Louney Tunes
• Diggersby - Pokemon X/Y
• Scorbunny -Pokemon Sword/Shield
• Glorbox - Rayman
• Jibanyan - Yo-Kai Watch