The theme of acceptance is also present. Ponies in Equestria need to accept Luna for who she is, including her insane side. And Luna herself needs to accept her past and move forward. In some fanfics, this is a central plot point, with Luna struggling to be accepted by the pony community while also coming to terms with her own identity.
One common theme is redemption. Since Luna has had a troubled past with her banishment and all, many fanfics focus on her trying to redeem herself in the eyes of the other ponies. For example, she might be trying to make up for the bad dreams she caused in the past.
One popular 'mlp insanity luna fanfic' is 'Luna's Redemption'. It explores Luna's journey after her return from the moon and how she deals with the changes in Equestria while still battling her inner demons.
One common theme is friendship. Since Spike and Luna are from different parts of Equestrian society, their friendship can be explored in many ways. For example, how they bridge the gap between a young dragon and a princess of the night.
Another theme is friendship. Even as a baby, Luna is shown forming bonds with other ponies or characters, like how she might interact with her sister Celestia in a more innocent and playful way. And these interactions help shape her future relationships. For example, in some fanfics, her early experiences with friendship teach her important values that she carries into her later life.
A common theme is friendship. Despite their different personalities, they often end up becoming friends in fanfics. Another theme is magic. Since both are associated with magic in the My Little Pony world, their magical abilities are often explored. For example, they might combine their magic to defeat a common enemy.
Redemption is a very common theme. Luna often has to prove herself after her return, making up for her past actions. For example, in many fanfics, she tries to regain the trust of the ponies in Equestria.
A common theme is identity. Since Luna is in a human form, she often has to grapple with who she is now compared to her pony self. Another theme is acceptance, both her accepting her new human form and the humans around her accepting this strange new being in their midst.
Good 'mlp insanity fanfic' often has well - developed characters. For example, they might give the ponies more complex personalities than in the original series. This makes the readers more invested in their stories.
I'm not sure specifically as I haven't read this particular fanfic. But generally, in MLP (My Little Pony) fanfics, they can be about all sorts of adventures, relationships between the ponies, or unique takes on the MLP universe. It might involve a wild or crazy journey ('rocket to insanity') which could mean a really out - of - control or extraordinary plot.
One common theme could be the battle between light and dark. Luna represents the moon and has an association with the night, which can be seen as a time of mystery and sometimes danger. King Sombra is a dark character. So the fanfic may explore this contrast in terms of their powers and personalities.
One key element is Luna's character. Since she's a complex character with a past of being Nightmare Moon, fanfics often explore her redemption and her relationship with the other ponies. Another element is the magical world of Equestria. Fanfics use this setting to create unique stories around Luna, like her connection to the night sky and moon magic.