His family were the keepers of the “Casket Of Ancient Winters”. He helped Thor defeat “Malekith the Accursed“.
His daughter is Verity Willis, Loki‘s best friend. When she was young, she swallowed Roger’s magic ring that allowed him to see the truth in any situation, gaining the powers of the ring. Roger got the ring from his father, Eric Willis, who had kept the Casket before him.