"Good" is a matter of personal opinion. Here are some links to try out.
Yes, there are many well-written Merlin fanfictions available online. Websites like Archive of Our Own and Fanfiction.net have a wide variety of fan-created stories featuring different genres, pairings, and plotlines that explore different aspects of the Merlin universe. You can use tags and filters on these sites to find fanfictions that suit your preferences.
Yes, there are fanfictions featuring Espio the Chameleon from the Sonic the Hedgehog series. These fanfictions can be found on various fanfiction websites and platforms where fans share their stories and creativity based on the character.
You can read stories by Hedwig466, ElphabaROCKS, LostOzian, and several other amazing authors at fanfiction.net.
Check out Dark. It's amazing.
I do not know of any account of Merlin in which anyone named Meadow appears. I do not know of any account of Merlin in which he is said to be married to anyone.
You can find some on the livejournal community called hermionesirius. But there are more of them on fanfiction.net.
You go to "Misc."
That is very weird, but yes, there are a few.
Yeah
maye
Please see the Related Link(s) below for a list of Gaara FanFictions.
BBC Merlin is not based on any book. It is based on the Arthurian legends but it is the directors and the writers interpretation of the legends.
See The Crystal Cave, by Mary Stewart.