Who is The Senior Wrangler from The Last Continent: A Discworld Novel and what is their importance?

The Senior Wrangler is one of the faculty members of Unseen University (UU) who in their search for colleague Rincewind enter a tropical island thousands of years in the past and make their way to the last continent, Fourecks. The unnamed Senior Wrangler denies that humans and apes are related. Although he has given up on the Librarian's survival and is worried about ferocious wild animals, he goes along. On Mono Island, he is attracted to the aging housekeeper, Mrs. Whitlow, who accidentally traps them there, finding himself unable to speak or function in her presence. Nearly everything he hears or says bears sophomoric sexual innuendo.