Ira

Ira is a malicious entity that possesses A.S. He seemed to be briefly mentioned by A.S. for a few seconds and was showing signs of being present. After Kazuma got tortured and shut himself in his room for being accused of stealing panties from Yuri and Kotonoha, he began to manifest and become more present over time. He seems to appear when A.S. is mentally weaker.

Appearance
Ira's features are not noticeable at all as they are completely obscured with entirely pitch black colors. But he seems to take on the same exact shape and look that A.S has. His eyes have red and white glowing swirls, and a psychotic permanent white grin stretching from ear-to-ear. A bunch of tiny, constantly slithering black tentacles protrude from Ira's back.

Personality
Ira has a ruthless personality and he always seems to have an extreme amount of anger. He is also a sadistic being as he takes pleasure in breaking people. This is shown through his interaction with Carter.

He doesn't seem to have any actual feelings for the entirety of the cast at all, the only feeling he has toward the Season 4 cast is hatred.

A.S.
The relationship between A.S and Ira seems mutualistic and parasitic at the same time. While Ira is one of his host's most powerful "abilities", he may be harmful to A.S and his surroundings physically, mentally, and psychologically. He is verbally abusive also as he openly claims A.S was responsible for Carter's trauma.

Carter
Ira seems to share resentment toward Carter McCoy. This could be proved by the interactions he and Carter had with each other. While he and A.S were confronting Carter, he managed to take form and brutally attack him, leaving his arm broken.

Ira, knowing about Carter's past uses this against him by showing a photograph of Carter's dead biological mother. This breaks him down to his most weakest and vulnerable point. He doesn't seem to feel any guilt or remorse for the poor cat at all.

Kazuma
Ira does not seem to show any care for Kazuma at all, claiming that Kazuma isn't real and that he doesn't exist. He clearly asks "why would he care about something that doesn't exist". Although, this may be A.S just saying that out of anger while arguing with Kazuma.

Trivia

 * Ira is canonically genderless. Although, he is mostly referred as a male by other characters.
 * If Ira's name is placed inside of Google Translate, it would be translated to "wrath" and many other words similar to it. Which fits in with his role as the wrath demon.
 * His original name was going to be "Asmodeus" but it was later changed.
 * His character seems to be inspired off of the Seven Deadly Sins.