Tetsuo is a boy's name.

Akira Fud
M (N Rf, Fudo Akira^?) is the main protagonist of the Devilman Crybaby anime 3️⃣ series. Once a regular human, he gained the power of the demon Amon after being inducted into a Sabbath ritual 3️⃣ organized by his best friend Ryo Asuka.