He’s apathetic. He’s merciless when killing for his job. He’s ruthless on the outside but once someone can get through that he’s a vulnerable, sad person. He only looks out for himself, not needing teamwork. He’s obsessed with getting validation from Dazai Osamu, who is his former mentor. Since you are part of the ADA, Akutagawa is conflicted with how he feels about you, he knows he likes you. With you being the enemy and all, but he still has feelings for you, and doesn’t wanna hurt you.