Nowi?

That depends. I have a 5* Nowi and I have to say that I regret every single one of the 20k feathers I put into making her a 5*. While she's a good unit, she's completely bland in my opinion. Her main style, like practically all dragons, is a super defensive style. Sit and wait for the opponent to try and kill you, then kill them in the process. While it can be effective in things like Dragon Emblem, it's not really my cup of tea to have a pure Enemy Phase unit.

If you like her, or want to invest in Dragon Emblem, then go ahead. She's pretty much needed for Dragon Emblem at this point. But if you're just wanting a 5* Nowi for the sake of having a 5* Nowi, then my suggestion is to save your resources.

Edit: Forgot to mention (if the mentioning is needed) that outside of Dragon Emblem, she can be a pretty good unit, especially with Aether and Steady Breath.

That's what I'm doing but it's good to wait for a second opinion

This is my armor breaker nowi. Same ivs.