Michael Sinterniklaas is an English voice actor and director for Pokémon who joined during its fifth season but is better known in other anime series. He is also the founder of NYAV Post, which has studios (and thus records) in both New York and Los Angeles.
- Michael Alexander Simon/Kappa Mikey (Kappa Mikey)
- Leonardo (Teenage Mutant Ninja Turtles (2003))
- Trey Racer (Shaman King)
- Riven (Winx Club, 4Kids version)
- Dean Venture (The Venture Bros.)
- Funshine Bear (Care Bears: Welcome to Carealot (2012))
- Tunnel Rat (G.I. Joe Sigma 6)
- Sinterniklaas, along with Lucien Dodge and Cristina Vee, is one of only three actors to have been involved in both Pokémon Origins and the main series.
- He has voiced two characters with the same name in the same region.
- When Winx Club was transferred from 4Kids to Nickelodeon, Mike passed on the role of Riven to fellow 4Kids VA Sam Riegel, who worked with him as Donatello in the 2003 remake of Teenage Mutant Ninja Turtles.
- Mike and former Pokémon VA Megan Hollingshead worked together in Bleach.
- Mike filled in for David Moo as Xellos Metallium in Slayers Revolution and Slayers Evolution R and replaced the departed Andrew Rannells as Nightmare for the Kirby 3D short based on Kirby: Right Back at Ya!.
- In Seasons 6-8 his voice for Seviper was sometimes mixed in with some of Chie Satō's vocals.