(=mature, well developed)
[person] épanoui (e)
→ My surly adolescent will one day turn into a delightfully rounded human being.
→ Religion can make you a nice, rounded person or it can make you an idiot.
→ He's a very intelligent, rounded person, capable of dealing with different nationalities, finance and sports medicine.
[character] fouillé (e)
→ a film full of rounded and involving characters