The Reginald who appeared in the film was Reggie Van Dough
That kid was every inch of the Spoiled Brat
Reggie Van Dough was portrayed as in the comics, the cartoon and the Christmas movie that featured what Richville would be like if Richie never existed
- Reggie IS short for Reginald. And Lawrence van Dough is his uncle, and his father's brother.
Reggie and Mayda will become a couple
As soon as she accepts she can't have Richie, she'll "settle for second best". Also, Reggie will want a girl who's practically as wealthy and arrogant as he is.
Where he is friends with the Joker.