Nagao's Japanese Wikipedia article indicates "きょぽりらん" is an alias for him, which is "Kyoporiran." Aside from that, I don't really have any insights for you. Murasaki and Akiyama are good bets for a Santos game, but none of those aliases look like surefire locks.
A
Japanese transcription of the credits lists "けんたくん.やだ!" on one line, so "Kenta-kun. Yada!" is probably just a single alias.