In Japan TBS are the broadcasters behind 3-weight world champion Koki Kameda and his brothers (Daiki and Tomoki). Whilst Koki is certainly the most well known the other two both have their fans. Tomoki has really created a fan base in Mexico with his "Mexican" style whilst Daiki has created an unusual following thanks to his unusual post-fight celebration.
Unlike the big names in the States who call out their next opponent and big themselves up (see Adrien Broner's disgraceful interview after the recent Paul Malignaggi fight) Daiki has been singing to the fans.
Whilst we all know Manny Pacquiao has a reputation as a singer and Tyson Fury has also been trying to impress with his voice, Daiki has been doing his in-ring post-fight sing for years as this clip from 2006 shows.
We need to say thanks to togikame for unloading the clip