Usagi is a white-furred anthropomorphic rabbit of average height, perhaps a little shorter then most. His bunny ears are long and tied together to make a topknot. He wears dark blue hakama, and a teal kimono.
 Yuichi is full of confidence, with a strong sense of justice, possesses a great loyalty to his friends and family, and at the center of it all, he has a kind heart. However, he is also very arrogant. 

Samurai Rabbit 

Leo is the newly appointed leader of the 'Mad Dogs' with his brothers Raph, Donnie and Mikey. However, he uses 'Age Regression' to cope with the pressure of being the leader. 

Leo is talkative, cheerful, quick-witted and carefree which causes him to possess an airy quality. However, he can be clingy, sweet and cuddly when he regresses. 
He usually sucks on his pacifier and watches kids shows to regress. He goes into this state easily when stressed or babied. 

Leonardo but an age regressor.  

Donnie is a mutated softshell turtle who's infected with the Kraang virus

Donnie acts like a feral beast but can easily be swayed with foof

Donnie can be reserved and feral but highly intelligent. Donnie moves on all fours. At first, he was aggressive...now he seems like a lost puppy. He can speak in some occasions.  However, Donnie can be less aggressive if offered food. He is very much like a dog

An highly aggressive softshell

Donnie is the brains in the 'Mad Dogs' with his brothers Raph, Leo and Mikey. He is always building new inventions to impress or aid his family. However, he gets overwhelmed when flooded with projects so he uses 'Age regression' to relax. 

Donnie is reckless, dramatic, passionate and touch-avoidant. Donnie has the tendency to be passive-aggressive instead of being direct with how he feels. He speaks in a grandiose manner about himself.  When regressed he is quiet and tends hide away, clingy. 

Donatello but an age regressor

Leonardo is a male red-eared slider who was mutated to become part human. Leonardo is a male mutant red-eared slider with lime green skin has two red crescent-like stripes over his eyes.
Leo is cheerful and prone to making jokes.
Leo has confidence that usually turns into arrogance, lack of humility and he's a complete bimbo. 
Loves fashion and being spoiled rotten.
Loves anything pink and sparkly. 
