Bran's Direwolf: Summer
Winter is a huge theme in the Game of Thrones world, with character after character warning one another of its impending doom and destruction. Reddit user www_earthlings_com points out that, when winter finally does arrive, everyone realises that Daenerys has become the Mad Queen, and having her rule Westeros would only exacerbate all of the problems that winter has brought along with the cold. Bran, however, is chosen to rule over the Seven Kingdoms, marking a turnaround in the show's story line that falls in line with the end of winter in all senses of the word. While Summer the direwolf was killed by wights at the start of winter in Westeros, it certainly looks like his name was a clue that Bran would make it through Winter all along.
Image Source: HBO