Who would be good characters to include in a Cave Story crossover fanfic?

You could include characters from other crime - themed games like Tommy Vercetti from Grand Theft Auto: Vice City. His experience in the crime world could create some interesting dynamics with the Mafia 3 characters. They could either be rivals or form an uneasy alliance.

In a crossover with Danny Phantom, Danny would be a key character. His ghost - fighting abilities and the Totally Spies' skills in dealing with more earthly threats could combine in an interesting way. For example, they could face a villain who has the ability to phase between the ghost zone and the human world, and Danny and the spies would have to use their respective skills to stop him.

Well, Hermione Granger would be a great character to put in an 'alanna the lioness crossover fanfic'. Hermione is extremely intelligent and well - versed in magic, and she could exchange knowledge with Alanna. Then there's Buffy the Vampire Slayer. Alanna, with her combat skills, and Buffy, with her vampire - slaying expertise, could team up to fight supernatural threats that are common to both their worlds. And don't forget about Legolas from 'The Lord of the Rings'. His archery skills and elven magic could complement Alanna's own abilities in a crossover story.

If it's a crossover with 'Doctor Who', the Doctor would be an amazing addition. His vast knowledge of different cultures and species could help the BAU in cases that have an otherworldly aspect. And his time - traveling ability could add an interesting twist to the story.

In a crossover with 'Powerpuff Girls', the Professor could be an interesting character to include. He might study Zim's technology and try to find a way to use it for good, while the Powerpuff Girls are busy fighting Zim's minions. And Zim would be both fascinated and enraged by the super - powered girls.

From other franchises, Link from The Legend of Zelda could be an interesting addition. His sword - fighting skills and puzzle - solving abilities would contrast with Sonic's speed - based combat. He could be on a quest in Sonic's world and end up teaming up with Sonic to defeat a common enemy. Another character could be Samus Aran from Metroid. Her powerful weapons and armored suit could bring a new level of badassery to the fanfic, and she could have some interesting interactions with Sonic and his friends.

In a crossover with Sailor Moon, Sailor Moon herself would be a great addition. She has her own powers and a strong sense of justice, just like Ladybug. Tuxedo Mask could also be interesting to pair with Cat Noir. Another good character could be Naruto from the Naruto universe. His ninja skills and determination would blend well with the Miraculous Ladybug world.

If it's a crossover with 'Tokyo Ghoul', Kaneki would be a great addition. His half - ghoul nature and his kagune abilities would make for some intense battles against the devils in High School DxD. Also, Touka's tsundere - like personality could create some interesting relationships with the characters in DxD.

Definitely Deadpool. His chaotic and fourth - wall - breaking nature would add a whole new level of craziness to the Suicide Squad. He could have some hilarious interactions with Harley Quinn, like competing for the 'craziest character' title. And his regenerative abilities would make him a valuable asset on dangerous missions.

Definitely Penny. She could bring her unique charm and abilities to the crossover. In a crossover with 'My Little Pony', for instance, she could interact with the ponies in a really interesting way, maybe teaching them about her world while also learning about friendship in Equestria.