i do anime or cartoon vioces all the time it is easy . but i like to do the voice of nobunaga oda or kenshin and say some of there famous lines or every once in awhile when i am around friends do a mario voice
I don't have the same level of deepness but I can talk like Sesshomaru (Inuyasha) and L (Death Note) I actually looked like L before I dyed my hair, my hair was spikey!!!
As in "deliberately impersonating an anime/manga character"? No.
But I have jokingly mimicked yakuza, as they are typically portrayed in various Japanese TV shows and movies. If that counts.