Do I need a trench coat and fedora to be a true ahri main?

No, you just need to avoid being the people who go the extra mile and label her as their future wife and roleplay around her.

Kind of like what I do with Shen, but that is a different story because he is S+ class viewing material.

Don't forget the shades

u need the mustache

Pretty sure you also must have a neckbeard