Facts in the 616

Real Name: Max Eisenhardt

Aliases: Magnus, Erik Magnus Lehnsherr, Erik the Red, Michael Xavier, The White King, The Grey King, The White Pilgrim, The Creator

Height: 6 feet, 2 inches / 188 cm

Weight: 190 lbs. /  86.25 kg

Hair: Silver

Eyes: Blue Grey
 
Known Relatives in the 616:

-Jakob (father, deceased)

-Edie (mother, deceased)
-Ruth (older sister, deceased)

-Erich (Uncle, Jakob’s Brother, deceased)
-Magda (wife, presumed deceased)
-Anya (daughter via Magda, deceased)
-Pietro Maximoff / Quicksilver (son via Magda)
-Crystal (ex-daughter-in-law via Pietro)
-Luna Maximoff (granddaughter via Pietro and Crystal of the Inhumans),
-Wanda Maximoff / Scarlet Witch (daughter via Magda)
-The Vision (ex-son-in-law via Wanda)
-Thomas Shepard / Speed (possible grandson via Wanda and the Vision)
-William Kaplan / Wiccan (possible grandson via Wanda and the Vision)
-Lorna Dane / Polaris (possible daughter via unknown mother)
-Talia Josephine Wagner / Nocturne (granddaughter from alternate reality via Wanda and Kurt Wagner / Nightcrawler)

Languages: Magneto has been shown speaking English, German, French, Russian, Ukranian, Hebrew, and Portugese. Given that his family did live in Poland for sometime and he was incarcerated there, and was Jewish, he almost assuredly speaks Polish and Yiddish. (And all this without the "telepathic language lessons" that the X-Men got.)

Biological adaptatons: It is theorized his powers are controlled by extra connections between his pons and his medulla oblongata. Electrolyte conduction through is nervous system is enhanced by a high iron count (450% above normal) in his blood. His personal biolelectic field is synchronous to the Earth's electromagnetic field to .003%. Magneto's biolectric activity is projected at seventeen thousand percent above normal. His neural synapse sparking is accelerated to 1450% above normal. (X-Men Unlimited #2)