Origins: JoJo's Bizarre Adventure (Part 5: Vento Aureo)
Classification: Human, Stand user
Threat level: Celestial+
Physical strength: Giorno is high human, GER ignores the concept of strength so its likely immeasurable
Destructive capacity: At least universe+
Durability: At least universe+
Speed: Immeasurable for GER (the concept of speed is 0 for GER)
Intelligence: High. Like most JJBA protagonists, he is a superb tactician with great analytical capacity, skilled and experienced fighter.
Stamina: High. Most characters in JJBA have shown to be capable of keeping themselves in combat even when receiving life threatening wounds. Although shouldn't really be relevant since normally he'd be able to reduce to 0 any negative effect inflicted against him.
Standard equipment: None noteworthy.