Well, Pinkie Pie is also a likely main character. She would be the one to throw a big 'Welcome to Pony - hood' party for Spike. She could also introduce him to all the fun and wacky things about being a pony. Rarity could be involved as well. She might take it upon herself to give Spike a makeover in his new pony form, making him look dashing and stylish among the ponies.
Well, it could be about Spike's adventures as a pony. Maybe he discovers new magical abilities that are unique to ponies. He might make new pony friends and go on quests with them in Equestria.
One sad MLP Spike fanfic could be about Spike feeling left out when the ponies are all busy with their own tasks and he feels unimportant. It might explore his loneliness and how he tries to find his place in Ponyville.
One popular fanfic could be 'Spike's New Form' where Spike's transformation into a pony leads to all kinds of adventures in Ponyville. He has to learn how to fit in with the other ponies and deal with his new abilities.
Well, there's a fanfic titled 'Spike as the Superhero'. It delves into Spike's journey of becoming a superhero in the MLP world. He has to overcome his insecurities and learn how to use his unique dragon abilities for good. There are also some really interesting character interactions in it. For example, his relationship with Twilight Sparkle evolves as he takes on this new role.
One possible fanfic could be about Spike finding a magical leaf that gives him the ability to communicate with plants. He then goes on an adventure in the Everfree Forest, using this new power to help the ponies. The leaves could be portrayed as having unique personalities and Spike has to learn how to interact with them.
One good MLP Sad Spike fanfic is 'The Lonely Dragon'. It delves into Spike's feelings of isolation when he feels left out by the ponies. Another could be 'Spike's Hidden Sorrows' which shows his internal struggles in a very poignant way. There's also 'When Spike Felt Blue' that explores his sadder moments through a series of events that make him question his place in Ponyville.
Spike MLP Fanfic is a type of fan - made literature that focuses on Spike in the context of My Little Pony. Fans write these stories for a variety of reasons. Some might be huge Spike fans and want to give him more spotlight. Others might want to explore different storylines that could have happened in the MLP world involving Spike. It can range from humorous tales where Spike gets into comical situations to more serious and emotional stories about his place in Equestria and his relationships with those around him.
There could be a fanfic where Spike is depressed because he is constantly underestimated. In the story, ponies always think he's just a baby dragon and can't handle important tasks. So he starts to doubt himself and falls into a state of depression. He then has to find his own worth and prove to everyone that he's more capable than they think.