After watching AoT and really liking the character Zeke, I can now instantly identify when Takehito Koyasu is voicing a character. It just happened while watching Frieren.
It’s always the same thing: a new character appears, I pause, tell myself “This is Zeke”, I go to MAL and voilà!
This man has such a unique voice.
Which voice actor has this impact on you?
I’ll add Mamoru Miyano to the list.
EDIT: Also, Jouji Nakata aka Alucard from Hellsing.