I don't know who the starhead guy is. The only hint I have is from this tweet.
Aqua NecklaceJojoUshijima KaoruYamikin Ushijima-kunTsukihara ShunMogura No UtaTakahashi NobuoDragon HeadPrince LuneNeko No OngaeshiYoshihikoYuusha Yoshihiko To Maou No ShiroKinoshita ToukichirouNobunaga Concerto (TV drama series)Hiruma IchirouTerra Formars (live-action film)ElizabethGintama (live-action film)Serizawa TamaoCrows ZeroAll of them are played by Yamada TakayukiKatagiri AnjuurouJoJo's Bizarre Adventure: Diamond Is Unbreakable (live-action film)CeserDragon Quest: Your StoryHoshiArakawa Under The Bridge (live-action film)