Who is Reginald from The Most of P.G. Wodehouse and what is their importance?

Reginald Pongo Twinsleton is one of two friends in a comedy act who pursue the same girl and fail terribly while having a miserable time in service to her school and church, only to learn that she is married. Pongo is the friend who attends the school treat. In "Uncle Fred", he is the nephew who watches nervously as his uncle improvises his way through adventures in escaping the rain.