Derived from the wiki:

"Tisha loves to keep organized, and is always open to helping her friends when it comes to tidying up! Teaching children how to keep their toys all tidy!"

Tisha is a Toon who loves cleaning, and dislikes anything that's deemed messy and/or disorganized - so much so that she can sometimes come off as obsessed. She possibly cleans too much and overworks herself. Despite her love of cleaning, she takes great offense and often gets quite frustrated with people not respecting the work she does, to the point where she'd either refuse cleaning requests, or outright show a dislike towards toons that she deems to not appreciate her work enough, as shown in her interactions with Vee. However, she does shows a more friendly side of herself to Shelly, as Tisha helping her clean fossils shows us she is more than just her fixation and will support the ones she cares about when needed.

I don't have a particular voice in mind. Do as you'd like, and i'll pick what I like best!