Amenadiel is the brother of Lucifer.
Gwen Seaborne is a fictional character from the TV show "Lucifer." She is a therapist and love interest of the character Amenadiel.
Some comic book characters are considered immortal, such as Marvel's Wolverine, Thor, and Deadpool, and DC's Wonder Woman and Vandal Savage. Other characters may have variations of immortality, such as healing factors or longevity, but it ultimately depends on the specific storyline and interpretation by the writers.