strange brain dude that all for one made,

nomu is off bhna, also known as my hero academia.

and he’s ugly

It means No one will marry you.it can also be customized in all sorts of manner like nowu(no one will witness you) Nofu ( no one will fuck you),etc

Someone with problems who tries to act cool.

NoMu stands for "Nothing Much, You?" or just nothing much. Created as a respond for "Wazue?"

In the world of MHA, the result of experiments involving the DNA of one or several human subjects, and a host that will take their abilities(s). Dead or alive. So much power cannot be contained by a normal human being, so they are modified for this reason... but the cost is their brain.