First, I love characters that are regularly puzzled by human beings / being human:
Spock
Data
Odo
The Doctor
Seven of Nine
Saru\

Second, I love strong female characters:
Katherine Pulaski
Kira Nerys
Kathryn Janeway!!!
SNW Uhura
SNW Chapel\

Third, I love queer characters:
Guinan
Garak
Jadzia Dax
Adira and Gray\

I might have forgotten an awfull lot of equally amiable characters, which doesn’t mean that I don’t love them.