Well, the bright and colorful style of My Little Pony can be blended with the more detailed and sometimes more realistic art of Disney. For example, the soft, rounded shapes of the ponies could be placed in a Disney - like landscape. The big eyes of the ponies could be adjusted a bit to fit the overall look when combined with Disney characters.
One way to combine them could be through a crossover story. Imagine the ponies from My Little Pony having to team up with Marvel superheroes to save Equestria from a common threat. For example, Rainbow Dash could fly alongside Iron Man, using her speed and his technology to outmaneuver villains.
One way is through the environment. The blocky landscapes of Minecraft can be populated with My Little Pony - style characters. Ponies can roam around the Minecraft plains, mountains and forests. Another way is through gameplay elements. For example, Minecraft's crafting system can be adjusted to include pony - related items. You could craft a pony saddle or a magic wand like in My Little Pony.
One way is to create a crossover universe where the characters interact. For example, the Autobots could visit Equestria and team up with the ponies to fight a common threat. The ponies' magic could be used in conjunction with the Transformers' technology.
The art styles could be combined by having the characters keep their distinct looks but interact with environments that blend both styles. For example, Cuphead and Mugman could be running through a hall in the Batim studio that has the dark, inky look of Batim but with Cuphead - style geometric patterns on the walls.
You could have the characters from Undertale drawn in a more FNAF - like style. For example, make Sans' eyes glow like the animatronics' in FNAF. Or give Frisk a more robotic look while still maintaining their Undertale charm. The backgrounds in the fanfiction could also be a blend. The colorful and somewhat cartoony Underground of Undertale could be made darker and more spooky like the FNAF settings, with broken animatronic parts scattered around.
One way to combine them could be through a magical portal. Maybe Twilight Sparkle discovers a spell that opens a portal to the world of Pirates of the Caribbean. Then, the ponies could interact with the pirates. For example, Rainbow Dash might be fascinated by the pirate ships and their ability to sail fast. She could team up with Jack Sparrow, with her speed and his wits making for an interesting duo.
A great crossover might involve the villainous characters. Maybe Discord from My Little Pony teams up with Maleficent from Disney. They could cause chaos in both their respective worlds and the ponies and Disney characters would have to work together to stop them. It would be an interesting mix of different magical powers and personalities.
The My Little Pony community can address this issue by actively moderating fan - created content. For example, on fanfiction platforms, moderators should look for and remove any fanfiction that involves such disturbing themes. Community leaders can also set up guidelines that clearly state that any form of content related to suicide is not acceptable.
One way is through education. Fans can be educated about the values of the My Little Pony franchise and why dirty fanfiction is not acceptable. Also, by promoting positive fan creations, the focus can be shifted away from inappropriate content. Social media groups and fan clubs can play a big role in this. They can encourage members to report any dirty fanfiction they come across so that it can be dealt with quickly.
One idea could be a crossover where the ponies visit Disney's Magic Kingdom. They could interact with Disney characters like Mickey Mouse and Minnie Mouse. Maybe they learn about different forms of magic in the Disney world compared to Equestria.