Aihana Etsu (Learning Core)

Aihana Etsu (藍花 悦) is a boy who, during the riots of "heroes" in Learning Core of Academy City, pretended to be the 6th ranked Level 5. This is backed up by Shokuhou Misaki who claims that he is only acting as the 6th-ranked Level 5.

"Aihana Etsu" is not his real name, it is the real name of the Number Six.

Etymology
The kanji for his name mean "blue", "flower", and "pleasure" respectively.

Appearance
Aihana Etsu is described as a childlike looking boy who appears at around the age of twelve, has shoulder length semi-long brown hair, wears a black hooded leather jacket, shorts and boots. His socks and underclothing are described as visible within his jacket.

Agitate Halation Arc
He is first seen at Learning Core, presumably drawn to it as one of the "heroes" of the Agitate Halation Project, fighting the other "heroes". They refer to him to be "Academy City’s #6" and "One of the seven Level 5s", but he tells them that those epithets are not his name and then proceeds to introduce himself to them. This is not because he does not claim to be the 6th ranked Level 5, but because he wanted them to address him by his proper name.

He effortlessly defeats people without using any powers, only using punches. This causes many of them to flee and pursue another target. While watching this battle from the side, Shokuhou Misaki comments that he only used his acting skills to play the role of the #6, and seeing that he is a fake Level 5, she has no connection with him. As such, she goes on with her own business.

It is currently unknown why he pretended to be the 6th ranked Level 5.

Abilities
His esper ability is unknown (if it even exists), however he is proficient enough in melee combat to completely overwhelm several dozens boys and girls, many of which are probably espers and are described as "heroes", while completely unarmed and without using any esper power. He also did not receive even a scratch while fighting them. His arms are described as "firing punches on the level of heavy machinery", and one hit can cause several boys to collapse.

He also apparently has acting skills on a good enough level to convince people he is the 6th Level 5 despite not using any esper abilities, as Misaki claims he is not the real one.

Quotes

 * (To his opponents, in NT7): “My name is not ‘Academy City’s #6’. Nor is it ‘One of the seven Level 5s’. My name is Aihana Etsu!!”