There are several characters who are played by particular YouTubers.
“Zaphrix is a member of Team Rocket. Zaphrix uses Ghost-type Pokémon, he used Dusknoir in episode...Zaphrix
“Mike is a character of Pokémon Gangster. His signature Pokémon is unknown, although his Raichu...Mike
“Elliot is a time traveller from the future. (more specifilly 10 years from the present day) His...Elliot
“Koga is the gym leader of Emerald City Gym. In episode 58, he hired Blaze to clean up his gym.Koga