Shamuon (しゃむおん) is an utaite with a smooth, mid-range voice that is often described as being sweet and "cute" for a male; despite this, he is not a trap singer. His voice is considered to be very versatile, and as such he has covered songs in many different genres. Since he made his debut on Nico Nico Douga at the age of 15, his voice has noticeably deepened over time; however it still retains a distinct, easily recognizable lilt.
He is good friends with Mi-chan, and the two of them share a very close relationship; which can be easily seen in Shamuon's live broadcasts and their live concerts. Fans have nicknamed their collaboration unit Michaon (みちゃおん), a nickname the pair have embraced officially as well. The pair have released 2 albums together, titled Stoic Party and MEET YOUR ONLY WORLD.
He is also good friends with Amatsuki and Kony, and they often hang out in real life. Together, they are known as Shamukonytsuki (しゃむこにつき). He is close friends in real life with GEM, who affectionately calls him Osha (おしゃ), as well, with whom he forms the unit Gemuon (じぇむおん).
His first upload was a parody cover of "Gekokujou", which is now set on private on Nico Nico Douga; he went on a brief hiatus in early 2010 to focus on school, removing many of his early uploads from public viewing. His first hit cover, and his most popular solo cover to date is "Petenshi ga Warau Koro Ni", which has over 1 million views and 32K Mylists as of August 2013.
He retired as an utaite on September 2013 after deleting his Twitter account. A formal announcement was posted on his blog on May 2014. He apologized for the inconvenience and retired from all of his Internet activities.
However, as of 2020, it's clear that Shamuon became a seiyuu. He works now under name Takagi Tomoya (高木朋弥). In Japanese Twitter, there are lots of recent tweets with hashtags #高木朋弥 and #しゃむおん with people discussing Shamuon's comeback as a seiyuu; some new photos can be found there as well.
None of the utaite are reffering to him as "Shamuon" now, posting tweets about his activities, meaning he is creating his new image regardless of his previous utaite career.