Basic Information:
Steven is the youngest of the crystal gems, at 14 years old as of season 2, and a human/gem hybrid. Though still very young and naive, he is very kind and understanding: he tries his hardest to see the best in humans and gems alike, even if they're out to get him.

His mother, Rose Quartz, fell in love with his father, Greg, and gave up her physical form and her gem so that she could bring Steven into the world. Though she no longer lives physically, Steven inherited her gems and it's powers that he tries hard to control.

Species: human/gem hybrid
Appearance:  Steven wears a pink T-shirt with a pale yellow star, Blue pants and red flip-flops. He has dark curly hair and dark eyes.His gem in on his belly is a rose quartz
Fusions: Stevonnie (Steven/Connie), Smokey Quartz (Steven/Amethyst)
Wepons: Bubble (with or with out spikes) and a Sheild
Abilities: Healing spit, Floating, Small amount of shape shifting
Relations: Greg (Father) Rose (mother)
Previous forms: None
 

Trivia

He is partially based off of Rebecca Sugar's own brother, Steven Sugar, who works as a background artist on the show