Naofumi Iwatani

Naofumi Iwatani (岩谷尚文, Iwatani Naofumi) is a character in Isekai Quartet who is introduced in the second season. He is the main protagonist in The Rising of the Shield Hero. After being transported in Isekai Quartet, he's now a student of Class 1.

Personality
He has a cold and rough personality. Due to his betrayal upon summoning in his world, he doesn't trust others easily and doesn't speak much. Though according to Raphtalia deep down he's a good person. One simply needs to be close to see it.

He also has some bias on those who talk about Gods, though justified considering the Church of Three Heroes incident.

Plot
While fighting a monster his shield is replaced by the Mysterious button and the monster pressed the button, transporting him to the world of Isekai Quartet.

After being seperated, he searched the school for Raphtalia and Filo, (at one point, he missed Raphtalita when she was talking to Ainz and Kazuma).

Powers & Abilities
As a Hero he has great power, though not on attacks but on protecting and shielding. He has mastered his power,and is perfect with teamwork with Filo and Raphtalia. He has great defense.

Air Strike Shield: Can create a strong transparent green shield mid-air to protect others.

Shield Prison: Allows him to surround him or another with a strong wooden shield with chains for protection.

Raphtalia and Filo
Two of the only people he trusts and cares for, giving a rare smile to them. More than willing to defend them as the two also show happiness towards him. Raphtalia does state though he's a bit difficult to talk to.

William
He is grateful for William explaining his situation to him. William also feeling similar to Naofumi as he too recalled having the same 'eyes' like him before. Possibly hoping Naofumi can to move on like he did.

Aqua
He doesn't find her trustworthy because she speaks of Gods, this doesn't help her much to Raphtalia's confusion.

Trivia

 * He is considered to be a side-character unlike the other four, Kazuma, Subaru, Tanya, and Ainz.