Sure is. Loki has been a significant part of Marvel Comics for a long time. He's known for his mischievous and sometimes villainous nature, but his character has had many layers and developments over the years.
One great Loki Marvel fanfiction is 'The God of Mischief's Redemption'. It delves into Loki's journey of self - discovery after the events in the movies. Another is 'Loki and the Avengers: An Unlikely Alliance' which explores an interesting scenario where Loki has to team up with the Avengers for a common goal. And 'Loki's Secret Realm' is also good as it takes readers into a mysterious realm created by Loki himself.
Loki is not typically shown as gay in the main comic continuity. But comics are diverse, and there might be rare instances or special editions where his sexuality is portrayed differently.
Yes, there have been instances of a female Loki in the comics. This adds diversity and complexity to the Loki character's portrayal across different story arcs.