Nightwing
Although Nightwing is commonly associated with Batman, the title and concept have origins in classic Superman stories. The original Nightwing in DC Comics was an identity assumed by alien superhero Superman when stranded on the Kryptonian city of Kandor with his pal Jimmy Olsen. Drawing inspiration from Batman and Robin, the two protect Kandor as the superheroes Nightwing and Flamebird. Following the Crisis on Infinite Earths continuity reboot in 1985, Nightwing was re-imagined as a legendary vigilante from Krypton whose story inspires Dick Grayson's choice of name when he leaves behind his Robin identity.
Tarja Turunen
Until the end of their collaboration, Turunen's singing was a trademark of Nightwish. She was known as the face and voice of Nightwish while bandleader Holopainen was the soul. Turunen was seen as a key to Nightwish's success. She is respected by other musicians of the metal genre and is an influence on their work; for instance, Simone Simons of Epica names her as her inspiration to study classical music and apply that vocal style to a metal band.