Polaris

Few characters in the Marvel Universe have demonstrated the kind of staying power that Polaris has — debuting in The X-Men #57 in 1969, she arrived in the Silver Age courtesy of the legendary creative team of Roy Thomas and Neal Adams, and she has never really left. With 361 catalog appearances spanning an extraordinary 57 years and 20 key issues to her name, she's woven deeply into the fabric of mutantkind's history, most prominently across The Uncanny X-Men, X-Men, and X-Factor. As a proud member of the X-Men, she keeps remarkable company — sharing pages with Wolverine, Cyclops, Havok, and the broader constellation of Marvel's most beloved mutants. For any collector serious about the X-Men's rich legacy, Polaris is an essential figure whose long, eventful journey through Marvel history makes her back-issue trail genuinely rewarding to chase.