For Tsuyu her voice is basically that of having a frog in her throat cause she is pretty much a frog though her voice is pretty mature sounding all things considered, for voice range I'd say mid-mid low. She is voiced by Monica Rial.

Character Description:

Tsuyu is a straightforward and laid-back individual who always says what's on her mind and what she thinks about others. She prefers to be called "Tsu", but has stated she only wants people she views as friends to refer to her as such.[1] She commonly refers to everyone with the honorific "-chan". She has proven to be very observant, as she was the first to note the similarities between Izuku and All Might's Quirks.

Tsuyu is noticeably calm and collected, being able to stay levelheaded in stressful situations. Smart and studious, Tsuyu is known for having great judgement and is rarely moved by emotion. She might disapprove rash decisions from her classmates, but she doesn't always act against said rashness, which is something she deeply regretted after the kidnapping of Katsuki Bakugo and Izuku Midoriya's decision to rescue him. Recovery Girldescribes her as the "perfect pillar of emotional support".[2]

Her usual expression consists of a vacant stare, which makes reading her thoughts and emotions difficult for those around her. Tsuyu has a habit of tipping her finger against her mouth while speaking or pondering. She also says "ribbit" as a replacement for many of her single word replies.