Jungkook is BTS's maknae (youngest member. Because of his many talents, Jungkook in particular is called the Golden Maknae.) He joined when he was incredibly young (13 or 14) and grew up in the band. BTS members attended his middle school and high school graduations.
Jungkook is very talented. Aside from being main vocalist, he is a good dancer and is often center in dance formations. He gets the most lines overall. As main vocalist, he has a breathy, stable voice that sounds very angelic.
Somehow, Jungkook is good at basically everything. EVERYTHIHG. He can dance, sing, rap, draw, run, lift heavy objects, box, play video games, do archery, and even wrestle. (One thing he is not good at is math. I think he might have failed math. He is also not that great at cooking.)
Since he joined BTS at such a young age, Jungkook was immersed in the lives of his six other members. Over time, his hyungs (older brothers/close older male friends) have taught him lots about life and have seen him go through all his phases. Even if he is an adult now, they still tend to treat him like he is a baby. Jungkook makes fun of his hyungs a lot, but he also respects them very much. In Burn the Stage, he spoke about how he might be a "manifestation of all their characters coming together." As he has grown up and matured, Jungkook cares about his team's success and hopes that they will soon accomplish all their dreams together.
Overall: jungkook is everyone's baby. a multi-talented, angelic, aesthetic baby, but a tiny baby bunny nonetheless.