So their channel is named "BangtanTV" and has seven current members: Yoongi, Jimin, Namjoon, Jungkook, Hoseok, Seokjin, and Taehyung. They upload a lot of "Bangtan Bombs" which is just them goofing around or hanging out or their travels together as a group of best friends. They've got their own segments and collaborative shows, though.
Yoongi: Their tech guy and director. Of course, does his "honest reviews" segment,  but also composes and shares music of his own, as well as an "advice with grandpa yoongi" segment and a couple of vlogs here and there. 
Jimin: mostly a vlogger and advice giver, collaborating with Yoongi sometimes to do advice videos together, often with conflicting (but hilarious) advice on certain subjects. He does a lot of hair care/skin care/makeup videos, often stating "a real man isn't ashamed to look his best!" 
Namjoon: a lot of MV reactions and album reviews, collaborating with Hoseok and Yoongi on albums they are all fond of. He likes to upload 3am talks too, talking about stuff like the purpose of existence and the fabric of time and space and deep things like that. He also uploads fashion hauls and his opinion on "fads" as well as shopping advice on a budget.
Jungkook: A lot of gaming. He puts on a lot of "Lets Plays" of horror games (especially with Hoseok) and indie games, basically anything with a cool storyline that he can do funny voices to. He also does most of the general Youtube tags, like "Throwback Tag" or "Draw my Life". He also sometimes uploads speed drawings, being a really good artist and sometimes some covers with other members.
Hoseok: The head of creativity in their channel, and is the king of overreacting, dancing, and is one of the most lovable guys on the channel. He does a lot of dance covers, skits, and the like. He enjoys dragging one of the members at random for "an adventure" somewhere and is known to choreograph dances and make the boys do the dances with him.
Seokjin: The foodie of their channel, does cooking vlogs and an "Eat Jin!" segment, which is crazily popular because wow how can he look so good doing literally anything that's incredible.. Also has a "Shame" series, where he basically picks a member of their group and rants about them. He likes to say "It's so hard being the oldest of these boys, they're just too much sometimes!" 
Taehyung: does literally anything and everything. Vlogs, Q&A sessions, reactions, he’s involved with a lot of stuff on the channel. Every once in a while he’ll upload a cover of a song and it gets like half a million views in like half a day, it’s crazy. He helps Hoseok with the creative process of their skits or dance covers.