There are many hobbits in the Fellowship of the Ring, but these are the main characters.
Frodo Baggins- The ring-bearer. He is the nephew of Bilbo Baggins. He does not like to be the ring-bearer, but knows that if he fails middle-earth is doomed. It is told in the book that he is the ring-bearer and that if he can't do it then it is hopeless cause noone else can. He is fighting the evil of the ring, which is slowly conquering him. He wanted to stay in Rivendell with his Uncle, but realizes that he must take Isildur's Bane (The One Ring) to the fiery pits of Mordor. He weilds a sword given to him by Bilbo and made by the elves, it's name is Sting. Bilbo got the sword from a cave in the prelude to The Lord of the Rings, The Hobbit. At the beggining of the story, he is 33 years old.
Bilbo Baggins- Frodo's uncle. He took Frodo in after his parents died. He is 111 years old in the beginning of the book. He was the first to offer to take the ring to Mordor. He is one of the main characters in The Hobbit, the prelude to The Lord of the Rings. He was the one to find the ring in Gollum's cave, and took the ring. He passes the ring on to Frodo when he sets off to Rivendell.
Samwise Gamgee- He is Bilbo Baggins gardener (when Bilbo sets off to Rivendell and leaves the house to Frodo, he becomes Frodo's gardener). He is very loyal to Frodo and he refuses to leave his side. He is Frodo's backbone through most of the book. He and the other main Hobbits (Frodo, Pippin, and Merry) are good friends.
Meriadoc Brandybuck- His nickname is Merry. He is a friend of Frodo and comes along as one of the "Company". He is loyal to Frodo and will not leave his side. Him and Pippin are very close friends, and together they tend to cause trouble every where they go. They get into just about everything.
Peregrin Took- His nickname is Pippin. He is a friend of Frodo and is a member of the fellowship of the ring. He is very loyal to Frodo and refuses to leave him. Him and Merry are friends, and tend to be mischievous when they are together.