Nerf (trademarked in capitals as NERF) is a toy brand created by Parker Brothers and currently owned by Hasbro.
 Most of the toys are a variety of foam-based weaponry, with other Nerf products including balls for sports like football, basketball and baseball.
 The most notable of the toys are the dart guns (referred to by Hasbro as "blasters") that shoot ammunition made from Nerf foam.
 Since many such items were released during the 1970s, Nerf products often feature bright neon colors and soft textures similar to the flagship Nerf ball.
 The slogan, which has been frequently used since advertising in the 1990s, is ""It's Nerf or Nothin'!""
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 Annual revenues under the Nerf brand is approximately US$ .
The Mark 42 5"/54 caliber gun (127mm) is a naval gun (naval artillery) mount used by the United States Navy and other countries.
 It consisted of the Mark 18 gun and Mark 42 gun mount.
 United States naval gun terminology indicates the gun fires a projectile 5 in in diameter, and the barrel is 54 calibers long (barrel length is 5" × 54 = 270" or 6.9 meters.)
 In the 1950s a gun with more range and a faster rate of fire than the 5"/38 caliber gun used in World War II was needed, therefore, the gun was created concurrently with the 3"/70 Mark 26 gun for different usages.
 The 5"/54 Mk 42 is an automatic, dual-purpose (air / surface target) gun mount.
 It is usually controlled remotely from the Mk 68 Gun Fire Control System, or locally from the mount at the One Man Control (OMC) station.
Pentatonix (abbreviated PTX) is a five-member American a cappella group from Arlington, Texas, consisting of vocalists Scott Hoying, Mitch Grassi, Kirstin Maldonado, Avi Kaplan, and Kevin Olusola.
 Characterized by their pop-style arrangements with vocal harmonies, basslines, riffing, percussion and beatboxing, they are widely known for their covers, mostly of modern pop works or Christmas songs, sometimes in the form of medleys, along with original material.
 Pentatonix formed in 2011 and subsequently won the third season of NBC's "The Sing-Off," receiving $200,000 and a recording contract with Sony Music.
 When Sony's Epic Records dropped the group after "The Sing-Off", the group formed its YouTube channel, distributing its music through Madison Gate Records, a label owned by Sony Pictures.
 With over 13 million subscribers and 2.4 billion views, Pentatonix's YouTube channel is currently the 50th most-subscribed YouTube channel.
 The group's video tribute to Daft Punk had received over 250 million views as of mid 2017.
The Nive Nulls is a YouTube channel of daily Vlogs, with over 350,000 subscribers.
 The vlogs feature the Null Family who live in Kansas City, Missouri.
 The family of five consist of husband, Austin his wife, Brittany, and their three young children Audriauna, Kailand, and Maddox.
 The Nulls are an interracial family; Austin Null is white and Brittany Null is African American.
 Austin Null was inspired by the vlogging family YouTube channel the SHAYTARDS to create their own YouTube channel.
 The Nive Nulls and the Shaytards were later to become friends can be seen making appearances in each other's Vlogs.
 The family posts videos Monday through Friday, of their daily lives as parents, which include typical family behaviors such as taking care of their children and eating together.
 They also include sharing their experiences of racism, interracial relationships, natural hair and, Christianity.
 They began their channel in 2010 and have over 60,000,000 views.
 Their channel has propelled other YouTube family vloggers such as Austin’s brother, Grayson Null and his wife, former gymnast Elyse Hopfner-Hibbs (Null).
 The Nive Nulls have over 80,102,662 views on their YouTube channel.
 In 2013 they won a Youtube Next Up Award.
 Brittany Null has her own Youtube channel titled "Britt's Breakdown" where she Vlogs about fashion, cooking and, motherhood.
Lia Marie Johnson (born November 23, 1996) is an American singer, songwriter, actress and Internet personality notable for appearing in various web series, including the Emmy-winning web series "Kids React" created by the Fine Brothers, and for her own vlogging and social media output.
 She is known for her starring role in the Nickelodeon movie "Terry the Tomboy" and for recurring roles in AwesomenessTV's Side Effects TV Series and My Music.
 In 2012 her personal YouTube channel, "Lia Marie Johnson", was reported to have received 16 million views.
 As of 2017, Lia's YouTube channel is reported to have surpassed 117 million views and currently maintains over 1.7 million subscribers, while her Instagram account was followed by 2.3 million followers.
 In a 2014 "Adweek" profile she was referred to as one of "10 of the biggest young stars on YouTube".
 In 2015 she was named one of the Top 100 YouTubers in the world.
React (sometimes stylized in all caps as REACT) is a media franchise used by the Fine Brothers consisting of several online series centering on a group of individuals reacting to viral videos, trends, video games, film trailers, or music videos.
 The franchise was launched with the YouTube debut of "Kids React" in October 2010, and then grew to encompass four more series uploaded on the Fine Brothers' primary YouTube channel, a separate YouTube channel with various reaction-related content, as well as a television series titled "React to That".
The DecimalBrothers (Decimal Brothers) are a web-based comedy duo consisting of two brothers, Homam Nasser and Mollie Nasser.
 They began posting videos on YouTube in February 2008, obtaining early success with the help of popular YouTuber, Davedays, who has premiered their first video on his YouTube Channel.
 Actors Ashton Kutcher and Liam Neeson have since posted a video of theirs on their Twitter accounts, gaining them more recognition.
 They have drawn viewers from some 100 countries, though they are most popular in the United States, the United Kingdom and the Middle East.
Germán Alejandro Garmendia Aranis (born 25 April 1990), known by his YouTube channels HolaSoyGerman.
 and JuegaGerman, is a Chilean YouTuber, comedian, musician, singer, and writer.
 He has produced a variety of songs together with his band Ancud, all available on YouTube and Spotify.
 His book titled "#Chupaelperro" came out at multiple stores of Latin America and Spain on 28 April 2016.
 His channels are currently the 2nd and 16th most subscribed on YouTube, having a combined total of over 50 million subscribers.
 As well as being the 2nd most subscribed Youtube Channel, his main channel, "HolaSoyGerman."
, is also currently the most subscribed Spanish-speaking YouTube channel.
 Furthermore, he was the first YouTuber to obtain two Diamond Play Buttons (for achieving 40 million subscribers on his two channels).
 He also gave his voice to the Spanish version of "" as Julian.
Gun Vs. Gun is a Canadian YouTube channel by two Nerf gun brothers, Tommy and Danny.
 The channel is known for their Nerf battles between these two.
 They sometimes do Nerf battles with other people in their family in their Nerf battles.
 They make 1 video every Wednesday and Saturday.
 Gun Vs. Gun has three million subscribers and one billion views.
 Their Nerf videos are made with the Nerf guns looking like they are real (modded like a real airsoft gun).
 Terrible Tommy / Tommy Gun invented the mods of the Elite and Mega Nerf darts.
Emma Approved is an American multi-platform web series starring Joanna Sotomura and Brent Bailey based on Jane Austen’s "Emma".
 The show is a follow-up to "The Lizzie Bennet Diaries" and is the third production out of web series company and YouTube channel, Pemberley Digital.
 In the series, Emma Woodhouse is reimagined as a lifestyle coach and matchmaker who is filming herself for the future documentary about her life.
 "Emma Approved" aired twice weekly on Pemberley Digital’s YouTube channel starting October 7, 2013.
 The show consisted of 72 episodes, ranging from five to seven minutes in length.
 The series ended on August 23, 2014 and has accumulated over 3 million views on the Pemberley Digital YouTube channel.

Question: Who created the toy brand used by two brothers, Tommy and Danny, on their YouTube channel Gun vs. Gun?
Answer: Parker Brothers