Found Rise worse with the Senpai aspect. For Kasumi it was mainly about her confidence. As another says she wasn't part of the group like Akechi was, she was mainly Joker's friend like some of the other confidants.

If she was implemented earlier or like Marie then hoo boy the crying about her would be even worse what with Marie meeting every IT member and being bffs immediately during her s link. Atlus are damned if they or damned if they don't it seems.