Marshall Bruce Mathers III / Eminem

He is a man marked by a very difficult childhood (poverty, absent father, troubled mother, bullying, constant moves in tough neighborhoods in Detroit and the surrounding area). This shaped him into someone reserved, shy in private, deeply private, and protective of his privacy. He finds it hard to trust and is very aware that fame distorts relationships: he doubts whether people love him or the public figure he is.
He's a devoted father above all else. He's said countless times that he's a father before he's a rapper. His daughters (especially Hailie, and also those he raised as his own) ground him, help him mature, and give him purpose. Family keeps him grounded and has been key to his sobriety and personal growth.
In person, he is usually described as kind, polite, thoughtful, humble, and with a good sense of humor (he can be playful and lighthearted when he's comfortable). He has an obsessive and perfectionist side when it comes to his work (routines, attention to detail, internal competition), but outside of work, he seeks normalcy and tranquility. He has dealt with addiction, anger, and trauma, and over time (especially after achieving sobriety) he has become more controlled, mature, and, according to those who have known him in recent years, more relaxed and even happy.
He is introspective and emotionally honest when he speaks about himself: he acknowledges vulnerabilities, guilt, insecurities, and the weight of his past. He is not the scandalous figure or the media monster; he is the survivor who channels pain and anger through art, but who in real life prioritizes protecting his loved ones, maintaining his peace, and not becoming what the public sometimes expects or projects onto him.
In short: Marshall Mathers is the quiet, protective, wounded but resilient guy, obsessed with doing his job well and, above all, with not letting his family down. The rest (Eminem and Shady) are artistic tools he uses or has used to express, exaggerate, or protect that real version of himself.