So about Nissa, I think the problem with her is that creative over invested in her greeness. What I read from Nissa's URs is a character that embodies the archetype of green's focus on the communal and interconnection. This could work as a great basis for a fully fleshed character but there's nothing else to Nissa (other than hinting at a past that doesn't exist anymore?).
Coming off that, she has no small scale. She doesn't have any little habits or smaller investments that help to really define someone. Jace loves a good puzzle and can be snark master supreme, Gideon has Munda and the Boros crew, Kiora tells the rules to go screw themselves and has her sister to worry about. There just isn't anything on that level for Nissa, she's got Ashaya but Ahsaya is literally Zendikar which is literally everything in the story that isn't white, chalky or Ob Nixilis.
Also hello, did you know ranting is a terrible way of introducing yourself?
Coming off that, she has no small scale. She doesn't have any little habits or smaller investments that help to really define someone. Jace loves a good puzzle and can be snark master supreme, Gideon has Munda and the Boros crew, Kiora tells the rules to go screw themselves and has her sister to worry about. There just isn't anything on that level for Nissa, she's got Ashaya but Ahsaya is literally Zendikar which is literally everything in the story that isn't white, chalky or Ob Nixilis.
Also hello, did you know ranting is a terrible way of introducing yourself?