Otake Naho

Otake Naho is one of the main characters of No Heroes Anymore/Owl-State, and is featured in most if not all episodes. She was born in Fujiboro on September 23, she was born in the house next to her cousin Zakai Yoshiiku, in the town of Shirahoro (a town located in Fujiboro).

Otake was bright from a young age, was well known for being the smartest kid in Shirahoro, as well as the strongest. Although she wasn't found out as an "Unordinary" until she was 13, everyone had a slight suspicion.

Powers and Abilities
Otake Naho is one of the most powerful known characters in the show/comic, having a Power Ranking of 7 (or three above her cousin Zakai Yoshiiku). The character of Otaku has:

Super intelligence

Super Strength

Phasing Abilities

Elemental Abilities (fire, ice, lightning etc...)

On the main character power listing in season 1, she is number 3. Although she is less powerful than her powers make it how to be, however that by no means makes her not powerful, it's just that her abilities like Elemental Control are so weak they are almost non existent (besides lightning control)

In her own dimension where she goes when she uses her ability, she is a god and as such has a god complex in the real world, thinking more of herself then she really should.

Relationships with other characters
Otake has a good relationship with most if not all of the characters, and in fact she actually feels like Shiro Taisho is her little brother and treats him as such.

As you already know Zakai Yoshiiku is her cousin and they have a pretty rock solid friendship they maintain for most of the series, but some things do transpire in season 2.

Otake does in fact have a crush on Erin, but he always refuses her advances, as he really doesn't quite like her, mostly due to her god complex.