It's hard to say who the 'best' is as it depends on personal taste. However, some authors who are quite popular in the Giant Little Ones fanfiction community are those who really capture the essence of the characters. They write in a way that makes you feel like the characters are acting just as they would in the movie.
There might be a fanfiction that focuses on the family dynamics of the characters in Giant Little Ones. Maybe a story where a character's relationship with their parents is explored more deeply, like how they deal with family secrets or how their family supports them during tough times at school.
In a Little Loki Frost Giant fanfiction, there could be a plot where he discovers new powers related to his Frost Giant heritage. For example, he could have an ability to create unique ice sculptures that hold magic. This could lead to a situation where he uses this power both for good, like protecting Asgard from a new threat, and also for mischief, like playing pranks on Thor by freezing his hammer in place for a while.
One common theme is inspiration. The Little Giant serves as a huge source of inspiration for the Karasuno players, and this is often explored in the fanfictions.
Perhaps Little Loki, as a Frost Giant, forms an unexpected alliance with some of the Asgardian outcasts. They might see in him a symbol of being different yet powerful. Together, they could work to change the rigid social structure in Asgard that discriminates against those who are not 'pure' Asgardian.
There are various types of interesting Haikyuu Little Giant fanfiction. For example, a story that details his first match and how he overcame his nervousness. It could describe his thoughts during the game and how he managed to turn the situation around. Another could be a fanfiction where the Little Giant has an unexpected encounter with an opposing team's star player outside of the court and they have a deep conversation about volleyball. Also, a story where the Little Giant mentors a young player who is having self - doubt could be really engaging.
Definitely Hinata. Since Hinata idolizes the Little Giant, a fanfiction with them together could be amazing. They could have training sessions where the Little Giant passes on his skills to Hinata. Another good character to pair with the Little Giant could be Kageyama. Their different playing styles could create an interesting dynamic in the story. And of course, Daichi. As the captain, he could learn a lot from the Little Giant's leadership on the court.
Well, in this fanfiction, Hinata might learn some amazing volleyball techniques from the Little Giant. Maybe they'll have a friendly match and Hinata will gain more confidence in his skills.
There is a fanfiction called 'In Search of the Little Giant'. It follows a new player who is inspired by the tales of the Little Giant and tries to find out more about him while also improving his own volleyball skills at Karasuno. This fanfiction has some really interesting character development and a great plot that keeps you hooked.
In this fanfiction, it's possible that the main antagonist could be an old rival of the Little Giant. This person might see Hinata as a threat because of his association with the Little Giant. They could try to create problems for Hinata during matches or training, like spreading false rumors or trying to psych him out. However, Hinata, with the inspiration from the Little Giant, would overcome these challenges.