I thought that maybe Majora was trapped in the mask like the Goron Mask or Zora MAsk. if so then couldm't that mean that as a person he was a child at heart or something
I had this idea that majora was never a person but maybe an weapon used by the Dark interlopers when they attacked Hyrule or that he was the leader of the Dark Interlopers and was banished into the mask and was trapped in Termina while the rest of the Interlopers were trapped in the Twilight...