Tsuyu Asui

Tsuyu is straightforward and aloof, speaking bluntly from her mind and freely expressing what she thinks about others. Tsuyu prefers to be called "Tsu" but only by people she views as friends. She commonly refers to everyone with the honorific "-chan", save for teachers and other authority figures.

Tsuyu's parents were always busy at work, requiring her to become the caretaker of her two younger siblings at a young age. Under these circumstances, Tsuyu grew into a highly mature and responsible individual who could divide her attention between school and home duties without letting one intervene with the other. This balance also means that Tsuyu knows how to lead and look after people, keeping them safe and at ease if they don't feel so. She has strong morals, goals, and principles and is willing to oppose her friends to defend them from rash decisions

Tsuyu is noticeably calm and collected, staying levelheaded and focused even during the most stressful situations. An honor student since middle school, Tsuyu has excellent judgment, can communicate her intentions easily, and is rarely moved by emotion, making her an incredibly dependable ally capable of covering for a partner's weaknesses. For those reasons, Recovery Girl describes her as a "perfect pillar of emotional support". However, even Tsuyu has limits when it comes to staying composed, having broken down in despair or heartbreak a few times. Her words may also come off as unintentionally harsh, thanks to her blunt honesty Her usual expression consists of a vacant stare, which makes reading her thoughts and emotions difficult for those around her while sometimes creeping them out in the process. Tsuyu habitually tips her finger against her mouth while speaking, pondering, or showing curiosity. She tends to say "ribbit", emulating a frog's croaking, at the end of her sentences or as a replacement for many of her single-word replies

Quirk Tsuyu's Quirk gives her a frog's physiology and allows her to do anything a frog can, giving her abilities such as:

Enhanced swimming abilities. Hopping at long distances. Extending her tongue up to a maximum of 20 meters (63 feet) (which is strong enough to lift an entire person's body weight). Sticking to walls. Ejecting/washing her stomach. Camouflaging herself. Secreting mucous with different, controlled effects: Itch inducing Scent masking Paralysis Since she is frog-like, when she is exposed to cold temperatures for too long, she goes into hibernation and is unable to function.

As part of her training, Tsuyu worked out all the muscles in her body, including her tongue, by rock climbing on the side of a cliff while having her elongated tongue remain in place at the top of the structure.