hi beckster. timely question. On my last gen, l had a hawainotchi and trained his stats to 84 69 387 respectively (l was trying to see if l can get a nonbiritchi the easy way lol) but in the end he became gozarutchi. lm not completely sure if universal teens will only become universal adults, but my advice is dun bother trying for a secret character lol.
peace
edit: in another of my past gen, my hawainotchi with stats above 80 each turned into a pyonchitchi.