Pietro Maximoff is a mutant who goes by the alias Quicksilver.
- Species: Mutant
- Place of Birth: Wundagore Mountain, Transia
- Gender: Male
- Formal Name: Pietro Maximoff
- Alias: Quicksilver
- Occupation(s): Adventurer
- Alignment: Good
- Affiliation(s): Avengers Academy, Mighty Avengers, Avengers, Inhumans Royal Family, Knights of Wundagore, Brotherhood of Evil Mutants, X-Factor
- Ancestor: Lucy Keough
- Maternal Grandmother: Anya †
- Paternal Grandfather: Jakob Eisenhardt †
- Paternal Grandmother: Edie Eisenhardt †
- Paternal Great-Uncle: Erich Eisenhardt †
- Paternal Aunt: Ruth Eisenhardt †
- Father: Max Eisenhardt
- Father's Clone: Joseph
- Mother: Magda Lehnsherr †
- Foster Father: Django Maximoff †
- Foster Mother: Marya Maximoff †
- Ex-Wife: Crystalia Amaquelin
- Clone: Pietro Maximoff
- Sisters: Anya Lehnsherr †, Wanda Maximoff, Lorna Dane, Zala Dane
- Adoptive Sister: Ana Maximoff †
- Adoptive Brother: Mateo Maximoff †
- Daughter: Luna Maximoff
- Nephews: Thomas Maximoff † and William Maximoff †
- Reincarnation of Nephews: Thomas Shepherd and William Kaplan
- Former Aunt-in-Law: Rynda
- Former Uncle-in-Law: Mander
- Former Father-in-Law: Quelin
- Former Mother-in-Law: Ambur Amaquelin
- Former Brother-in-Law: Vision
- Former Brother/Cousin-in-Law: Blackagar Boltagon †
- Former Sister-in-Law: Medusalith Amaquelin
- Former Nephew: Ahura Boltagon
- Former Cousin-in-Laws: Gorgon, Karnak, Triton, Maximus, and Psynapse
- Speed Physiology: the ability to have one's body adapted to moving at superhuman speeds.
- Superhuman Speed: the ability to move at super speeds.
- Molecular Destabilization: Pietro can make something disintegrate by touching it.
- Molecular Combustion: Pietro can make something explode by touching it.
- Superhuman Strength: He has superhuman strength in his lower body.
- Enhanced Durability: the ability to have more durability than humanly possible.