Arnold Rabbit 19 the middle child and smartest of the family, Arnold is a optimistic, enthusiastic, shy little goober. He shifts personalities based on who he's around. Sometimes his actions come off as arrogance, but his brain thinks so many steps ahead that he's paralyzed with indecision. (TMNT reference)

For his voice i suggest go for

https://youtu.be/0X_TisbYVS8?si=EOPnuDqEl-hr8BNm

Freckle LACKADAISY 

Moxxie HELLUVABOSS

Donnie TMNT MUTANT MAYHEM OR TOTTMNT