Is there anyone that gets off only to one character ? And if yes , do you not get bored ?

Not really, but there are a few that are more frequent than others. Lately it has been Frankie Foster and Gwen Tennyson more often. It used to be Ahsoka, and before that Judy Jetson.

For me it's a tie between 4 characters
Haruka sawamura from the yakuza series
Gwen tennyson from Ben 10
And sarada uchiha and himawari Uzumaki from boruto