A Laketown girl who is curious about the outside world could be a main character. She would be drawn to Bilbo because of his tales from far - away lands. And an old wise man in Laketown who has knowledge of ancient remedies could also be a main character. He would try to use his knowledge to help Bilbo regain his sight and health.
One possible plot could be that Bilbo, being blind, has to rely on the kindness of the Laketown people to survive his sickness. Maybe he befriends a local healer who tries different remedies. The people of Laketown might initially be suspicious but then grow to care for him as they learn of his adventures.
One possible plotline could be Bilbo dealing with his new disabilities while still trying to contribute to his community in the Shire. Maybe he uses his wits in different ways now that he can't rely on his sight as much.
There could be the company's CEO, who might be initially hesitant about adopting Bilbo but later sees his potential. Another character could be Bilbo's mentor in the company, someone who helps him understand how things work.
Frodo could be one. Since he was also closely associated with the ring in the original story, he might play a role in this fanfic, perhaps as a supporter or someone who has doubts about Bilbo's ability to destroy the ring.
Finding 'blind and sick Bilbo fanfic' could be a bit of a challenge. One option is to look for fanfic writers who are known for exploring unique or different takes on characters. Follow their profiles on fanfic websites and see if they have written anything related to this concept. Another thing to consider is that the Tolkien fandom is vast, and sometimes it takes a lot of digging to find exactly what you're looking for.
Well, perhaps in the fanfic, Bilbo, despite being blind, has developed an extraordinary sense of smell. He could use this ability to detect the presence of friends and foes. For example, he might be able to tell if Gandalf is approaching just by the unique scent of his pipe -weed. He could also sense the danger of orcs by their foul smell, and use this to warn his companions. This new ability could lead to all sorts of adventures where his sense of smell becomes a crucial element in their quests.
Obviously, the growing Orcs themselves could be the main antagonists. Their increased size and strength make them a greater threat to Bilbo and the other good - natured races in Middle - earth.
Perhaps a rival adventurer who discovers Bilbo's secret and tries to use it against her. This antagonist could be jealous of Bilbo's place in the group and sees her secret as a way to undermine her and take her position. He might spread rumors or try to create situations where Bilbo's secret is likely to be revealed.
You can start by looking on fanfiction websites like Archive of Our Own. It has a large collection of various fanfics, and there's a good chance you'll find some 'blind bilbo fanfic' there.
One great 'blind bilbo fanfic' might be those that explore Bilbo's inner strength. For example, a story could focus on how he overcomes his blindness and still manages to contribute to the adventures. It might show his sharp mind compensating for his lack of sight.