Michael Peter Aranda (born February 27, 1986) is an American vlogger, musician, and professional online video producer originally from Chino Hills, California.
 He is best known for his association with Hank Green of VlogBrothers and their work on SciShow.
 As of April 2015, his main YouTube channel has over 230,000 subscribers and more than 10.8 million total video views.
Sabrina Cruz is a Canadian YouTuber best known for posting videos on her main channel, NerdyAndQuirky, which she launched in 2012.
 As of June 2016, the channel had over 157,000 subscribers.
 She also runs two other channels: TheSeriousBiscuit, which is dedicated to vlogging and music, and What The Fanfiction, a channel where different Internet personalities read unusual Internet fanfiction.
 She also hosts "Crash Course Kids", the children-oriented version of the educational YouTube series Crash Course.
 Originally from Toronto, Ontario, she graduated from Notre Dame Catholic Secondary School in Ajax.
 She posted her first video on YouTube when she was in grade 7; the now-deleted video depicted her eating a cookie.
 As of October 2016, she was a first-year undergraduate at the University of Toronto's Innis College, Toronto, from which she received a Schulich Leader Scholarship in that year.
 She is studying mathematics at the University of Toronto, and hopes to do financial work for a big company.
 She spoke at one panel at the 2015 VidCon, where she also moderated another panel.
DaddyOFive is a YouTube channel and online alias of Michael Christopher "Mike" Martin, which focused on daily vlogging and prank videos.
 The channel's videos featured Martin, his wife Heather Martin—also known by her online alias MommyOFive—and their children.
 In 2017, following claims that the parents were abusing their children in the prank videos, the channel became the center of a controversy, as many saw their content as extreme in nature.
 Created in 2015, the channel achieved success earning up to 176 million video views and around 750,000 subscribers.
 However, after the aforementioned controversy, all videos on the channel were removed, and the Martins stopped producing videos on the channel, aside from a formal public apology video.
 In September 2017 Mike and Heather Martin took an Alford plea in regards to two counts per person of Maryland state child neglect charges and received supervised probation for five years.
Roman Bernard Atwood (born May 28, 1983) is an American YouTube personality, comedian, vlogger and pranker.
 He is best known for his vlogs, where he posts updates about his life on a daily basis.
 His vlogging channel, "RomanAtwoodVlogs", has a total of 3.6 billion views and 13 million subscribers.
 The channel is currently the 50th most subscribed channel on YouTube.
 He also has another YouTube channel called "RomanAtwood", where he posts pranks.
 His prank videos have gained over 1.4 billion views and 10.4 million subscribers.
 Both of these channels are in the top 100 most subscribed on YouTube, and he became the second YouTuber after Germán Garmendia to receive two Diamond Play Buttons for his two channels.
Wendy Ayche (born January 9 1986) known professionally as Wengie, is an Australian YouTube personality and vlogger.
 She was born in Guangzhou, China.
 She got the nickname "Wengie" at a dance class when two people gave her a nickname inspired by her Chinese name, Wén Jié.
 Since starting her channel on February 11 2013, her videos have received over 281 million views, and her channel has accumulated over 11 followers In the January 2016 edition of "ElleGirl Japan", she was nominated as a channel to watch.
 In August 2016, she was ranked the 5th Fastest growing channel in the world.
 Ayche was featured in the annual YouTube Rewind in 2016 and was also singled out by Google as one of the top beauty creators in the Asia region.
 Ayche reached 5 million YouTube subscribers in January 2017, and her channel is currently in the 12th most subscribed How-To & Style Channel on YouTube.
 She is also currently a board member of the Internet Creators Guild, a non-profit focused on providing the protection, representation and guidance to online creators.
 Her YouTube channel also recently got awarded with "Best Channel" as well as "Overall Winner" for the Australian Online Video Awards.
Jenna Nicole Mourey (born September 15, 1986), better known by her pseudonym Jenna Marbles, is an American YouTube personality, vlogger, comedian and actress.
 As of June 2017, her channel has over 2 billion video views and 17 million subscribers, making it the 28th most subscribed channel on YouTube and the second most popular channel operated by a woman.
James Alfred Chapman is an English YouTube vlogger, blogger and model, who is best known for his pop culture, vlogging and men's fashion YouTube channel.
 He occasionally makes Q and A's and Favourite videos, and also daily vlogs on his second channel, EveryDayJim.
Dennis Darrell Roady (born June 6, 1983) is an American YouTube personality best known for his Internet-posted pranks and his association with YouTubers Roman Atwood and Vitaly Zdorovetskiy, leading to starring in the feature film "Natural Born Pranksters".
 He hosts the YouTube channels Dennis Roady Deeds and howtoPRANKitup.
 He is a cast member of the web series "", in which 10 Youtubers are placed in a zombie apocalypse scenario.
 As of August 11, 2017, his howtoPRANKitup channel has over 3.4 million subscribers and 567 million views.
Lilly Singh (born 26 September 1988) is a Canadian YouTube personality, vlogger, comedian, writer, and actress.
 She is better known by her YouTube username IISuperwomanII.
 Since beginning her channel in October 2010, her videos have received over 2 billion views, and her channel has accumulated over 12 million subscribers.
 In 2016, she was ranked 3rd on the "Forbes" list of the world's highest paid YouTube stars (behind Roman Atwood and PewDiePie), earning a reported $7.5 million in 2016.
 Singh has featured in the annual YouTube Rewind every year since 2014.
 She ranked 1st on 2017 Forbes Top Influencers List in the entertainment category.
Marques Brownlee, also known by his YouTube username, MKBHD, is an American vlogger, best known for his technology-focussed YouTube channel.
 The channel, whose name is a concatenation of MKB (Brownlee's initials) and HD (for High Definition), has over 5 million subscribers and over 619 million total video views.
 In August 2013, Vic Gundotra, former Senior Vice President, Social for Google, called Brownlee "the best technology reviewer on the planet right now".
 During one of the 2016 Democratic presidential primary debates that was cosponsored by YouTube, Brownlee asked the candidates, by video, whether tech companies and the government can find a middle ground over encryption while considering rights to privacy and national security.

Question: Dennis Darrell Roady is best known for his Internet-posted pranks and his association with a comedian, vlogger and pranker whose vlogging channel has how many subscribers?
Answer: 13 million