Mark Edward Proksch (born July 19, 1978) is an American comedian and actor. He is perhaps best known for a series of pranks he played on television news stations under the pseudonym "Kenny Strasser" or, as he would sometimes refer to himself, "K-Strass." Proksch would contact local news stations claiming to be a yo-yo expert. When he was booked on a show he would befuddle the interviewers with his long, rambling monologues and his inability to perform any real yo-yo tricks. Proksch's exploits gained him a wide audience and made him an overnight YouTube star.

Mark Proksch plays as Colin Robinson, Colin Robinson, Baby Colin in What We Do in the Shadows.
Mark Proksch is the top #1 member of the cast and appears in 40 episodes.

Natasia Charlotte Demetriou is an English-Cypriot comedian, actress and screenwriter.

Natasia Demetriou plays as Nadja in What We Do in the Shadows.
Natasia Demetriou is the top #2 member of the cast and appears in 40 episodes.

Kayvan Novak (born 23 November 1978, Cricklewood, North London) is an award winning British Iranian television actor and voice artist. Description above from the Wikipedia article Kayvan Novak, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Kayvan Novak plays as Nandor the Relentless in What We Do in the Shadows.
Kayvan Novak is the top #3 member of the cast and appears in 40 episodes.

Matthew Charles Berry (born 2 May 1974) is an English actor, comedian, writer, and musician. He has appeared in comedy series such as The IT Crowd, Garth Marenghi's Darkplace, The Mighty Boosh, Snuff Box, The Wrong Door, and House of Fools. He currently plays the lead role of Steven Toast in the Channel 4 sitcom Toast of London, for which he won the 2015 BAFTA Award for Best Male Performance in a Comedy Programme. Starting in 2019, he has starred in the FX television series What We Do In the Shadows and the sitcom Year of the Rabbit. Matt is a strikingly shy and retiring in person. His hair - long, luxuriant, constantly being pushed back from his face - might be the loudest thing about him. He is, he says several times, “a very private person”. So much so, that when we talk briefly about the fact he has just moved out of London to somewhere with a bit more space, he looks suddenly stricken and asks me not to name the place. “I don’t want anyone to know where I am, really. If that’s alright.”

Matt Berry plays as Laszlo Cravensworth in What We Do in the Shadows.
Matt Berry is the top #4 member of the cast and appears in 40 episodes.

Javier "Harvey" Guillén is a Mexican-American actor best known for his role as Guillermo de la Cruz, a human familiar, in the 2019 television series "What We Do in the Shadows." Guillén has appeared as Alistair Delgado in "Huge" (2010), Cousin Blobbin in "The Thundermans" (2013-2018), George Reyes in "Eye Candy" (2015), and Benedict Pickwick in "The Magicians" (2017-2018). He also appeared in "The Internship," a 2013 film.

Harvey Guillén plays as Guillermo de la Cruz in What We Do in the Shadows.
Harvey Guillén is the top #5 member of the cast and appears in 40 episodes.