Who is this mystery coach that we see singing at all the fan events?

Time Codes:

:30 Newsflash
:45 Takanosho married
3:30 Takanohana got a puppy
5:15 Fanny Packs/Bum Bags
6:10 Sumo wrestler fanny pack commission
8:30 Sumo Chicken Podcast
9:50 Tokiwayama oyakata
12:30 Takakeisho got officially married
16:40 Okamisan is a DJ
19:30 Game of thrones type of confusion
20:00 He acquires Takakiesho in 2018
25:00 The Tokiwayama website
33:00 Alaska or Asakusa vacation
36:00 Scratchin' records

Music:
"Advanced Japanese Folk" by Audiotoolz
https://freemusicarchive.org/music/Audiotoolz/ProgressiveFolk/02-audiotoolz-advancedjapanesefolk
Under creative commons license: https://creativecommons.org/licenses/by-nc-nd/3.0/
News Theme by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
Artist: http://incompetech.com/
Intro/Outtro music by MARiAN - Tokyo Trap_
Vaquero Perdido Mini Vandals from the Youtube Free Music Library

Sources:
https://www.nikkansports.com/battle/sumo/news/202407020000914.html
https://www.nikkansports.com/battle/sumo/news/202406280000509.html
https://www.25ans.jp/wedding/report/g61001152/yukina-wedding-240626-vc/

https://en.wikipedia.org/wiki/Takamisugi_Takakatsu
https://sumodb.sumogames.de/Rikishi.aspx?r=1302
https://www.sumo.or.jp/EnSumoDataSumoBeya/detail/10014/
https://www.asahi.com/ajw/articles/13059127
https://alchetron.com/Takamisugi-Takakatsu
https://sumowrestling.fandom.com/wiki/Takamisugi_Takakatsu
https://takamisugi.com/