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"Atsushi is a cinnamon roll ray of sunshine."
WRONG.
Atsushi is a little sass who would do anything he needs to in order to survive. He saved dazai (when he intended to rob him )and then was upset he wouldn't thank him.
He shoved over the trash can in the second episode and basically told dazai to khs.
He had knowledge of the future, a future where four million people were going to die, and deliberately used that knowledge just to mess with Dazai because he could.
He will call you out on your flaws and judge you for them. Sure he's nice and a people pleaser a lot of the time, but inside, he's a little judgy sass and we love him all the more for it.