Arsenic

A compact but collector-noted presence in Marvel's Modern Age, Arsenic debuted in 2005 and is most closely associated with the pages of Runaways — one of Marvel's most beloved series of that era — sharing the spotlight with the likes of Gert Yorkes and an eclectic cast that includes Captain America and Power Man. With appearances catalogued across the Official Handbook of the Marvel Universe titles, Arsenic has earned a place in Marvel's reference canon, and the fact that one of just three recorded appearances carries key-issue status makes this a character worth a second look for any serious Modern Age collector.