I think Alya is cool. The only thing is that she's a reporting and she literally looks for EVERYTHING to put on the Ladyblog so sometimes she may publicly relase information that she doesn't understand very well that Hawk Moth or Mayura can understand so people start piecing things together. For example in Sentimonster and that other episode where she found the english book. I love her but I don't think she understands that the identities are supposed to be a secret if she publicly posts clues about who Ladybug is.
Tell me what you think :)