Taliyah's dialect changes with each language
In shuriman and common language, it's relaxed. She understands both well, so it's relaxed and regularly uses slang.
In Noxus and Demacia, she's less confident. The words are shaky, and her voice is softer. If Taliyah trips over a word or says something wrong, how is she supposed to know?
The languages in Bilgewater and Shadow Isles? Yeah, no, she struggles. Can't even say/understand a single sentence.
Ionia... now that's interesting. While she understands it, it's hard on her tongue. Due to that, her sentences seem stressed, shaky, and unsure. Taliyah understands barely any slang