YouTube channels launched in 2012

Seán William McLoughlin (born 7 February 1990), better known as Jacksepticeye, is an Irish YouTuber best known for his vlogs and comedic Let's Play series. As of February 2021, his channel has over 13.8 billion views and 26.3 million subscribers, and is the most-subscribed Irish channel. He has participated in fundraisers that have raised millions for charity.

Mark Edward Fischbach (born June 28, 1989), known online as Markiplier, is an American YouTuber, gamer-commentator, actor, and comedian. Originally from Honolulu, Hawaii, he began his career in Cincinnati, Ohio, and is currently based in Los Angeles, California.

Marzia Kjellberg (née Bisognin born 21 October 1992) is an Italian Internet personality, fashion designer, businesswoman, ceramics artist, and one-time author. Known for her videos on her now-inactive YouTube channel, Kjellberg has also ventured into writing, fashion designing, and business. She is married to Swedish YouTuber PewDiePie.

Kai Carlo Cenat III ( KY sin-AT; born December 16, 2001) is an American online streamer and YouTuber. He is best known for his live streams and comedy-based content he uploads on YouTube. He is currently the second most-subscribed Twitch streamer and the 14th most followed Twitch streamer with approximately seven million followers, surpassing Ludwig Ahgren's record during a February 2023 subathon. He was named "Streamer of the Year" at the 12th Streamy Awards and the 2023 Streamer Awards.

Jimmy Donaldson (born May 7, 1998), better known as MrBeast, is an American YouTuber, Internet personality, businessman, and philanthropist. He has been credited with pioneering a genre of YouTube videos that centers on expensive stunts.

David Nagle (born 6 July 1992), professionally known by his online name Nogla (formerly Daithi De Nogla), is an Irish YouTuber known for making gaming videos. He has been described as one of Ireland's top YouTubers.

Emma Louise Blackery (born 11 November 1991) is an English musician, singer, YouTube vlogger, record producer, and author. Active since 2012, Blackery has released EPs, singles, and Vevo music videos. She has toured with Busted, and headlined tours for her debut studio album Villains, released on her RWG Records label in 2018.

Anna Stewart Brisbin (born September 13, 1991) is an American YouTuber and voice actress known for her YouTube channel Brizzy Voices. She is known for her voice impressions of fictional characters, such as Harry Potter, Pokémon and the Disney Princesses, as well as Disney characters in general.

Joseph Allen Maldonado-Passage (né Schreibvogel; born March 5, 1963), known professionally as Joe Exotic, is an American former zoo operator, activist and convicted felon. The former owner and operator of the Greater Wynnewood Exotic Animal Park (a.k.a. G. W. Zoo) in Wynnewood, Oklahoma, Exotic had claimed to be the most prolific breeder of tigers in the United States. Before working with animals, he was a police officer, briefly serving as the chief of police in Eastvale, Texas. Exotic has had three unsuccessful runs for public office: for President of the United States in 2016 as an independent and for Governor of Oklahoma in 2018 as a Libertarian; in 2017, before officially entering the race for Governor, he filed as a candidate seeking the Libertarian nomination for President.

Alan Olav Walker (born 24 August 1997) is a Norwegian music producer and DJ, primarily known for his single "Faded" (2015), which was certified platinum in 14 countries. He has also released several known songs including "Force" (2015), "Sing Me to Sleep" (2016), "All Falls Down" featuring Noah Cyrus and Digital Farm Animals (2017), "Darkside" (2018), "Diamond Heart" (2018), "On My Way" featuring Sabrina Carpenter and Farruko (2019), and "Alone, Pt. II" featuring Ava Max (2019), all of which attracted hundreds of millions of views on YouTube. Three of his songs—"Faded", "Alone" (2016) and "The Spectre" (2017)—have garnered over a billion views on YouTube.