Remus Lupin

Remus Lupin excelled in almost everything. He had good grades at Hogwarts, was appointed a prefect, assisted in the creation of the extraordinarily detailed and magical Marauder's Map, and was capable of casting a Patronus easily.

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Apart from being an accomplished magician, one of Remus's greatest talents was helping others realize their potential. He was regarded as the finest DADA instructor that Harry and his peers at Hogwarts had ever had. By the time Lupin departed from Hogwarts, Harry was proficient in the use of sophisticated protection charms. Without Remus Lupins as a mentor, would Harry Potter have been an Auror?

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Remus Lupin eventually left his wife and their son Teddy to go and serve at Hogwarts war, in order to provide a better life for his family. He wanted to save his kid from a world ruled by Voldemort. When Harry Potter used his Resurrection Stone, Remus appeared among Harry's recently-deceased loved ones. Remus addressed Harry about his newborn baby, saying, 'I am sad as well… Regrettably, I will never meet him... but he will understand why I died. I was attempting to create a world that would give him happiness.'