Tiger's 1st appearance was in Episode 172 in her introduction arc, the same way that Olga made her first appearance. In the very next episode that she appears in she sees Nerd for the first time, and then she develops a very big crush on Nerd. So for the rest of her introduction arc, she tries to express her feelings towards Nerd, but by the end of the arc she tells her feelings to Nerd by kissing him at the back of the school. After she kissed him, the rest of the gang figured out that she loves Nerd, and so they invited Tiger to join the group. Her personality is your typical tough, tomboy girl character with a ton of strength, and she is also a delinquent at school. She is really cool friends with Jock and Olga respectively. With Jock being simular to her in strength, and Olga for being her girl bestie and hangout with each other, with Olga giving her advice about how to get boys. Nerd however is a special one, because he is kind of her boyfriend. After kissing him in the back of the school, they started hangout with each other more outside of school, and after a while they started confessing their feelings for one another. And now, they're now shown in a relationship.

Her voice should sound like your typical tough, tomboy girl that she's supposed to be. But can also switch from a quiet normal tone of voice, to a load, scary, and enraged tone of voice whenever tries to upset or hurt Nerd. Like, Rainbow Dash for an example.

Here's some voices reference:

https://youtu.be/sX1kBtorpJo?si=C-OKV1hr6Jrv8rSH

https://youtu.be/GBKLDXBJIHo?si=5gKVQFH2ImU2XS0y

https://youtu.be/DFP-nUnOf5g?si=lYBeVIHdmudTNBGP