I think Finn from 'Glee' would be interesting. He has that all - American boy charm. In a crossover, he could be the bridge between the two groups. He could befriend Jesse from 'Pitch Perfect' and together they could try to bring the groups closer. Finn could also be in a bit of a love triangle with a girl from the Bellas and a girl from New Directions, adding some romantic drama to the fanfiction.
Rachel Berry from 'Glee' would be a key character. She is so ambitious and has a strong vision for music. In a crossover, she could clash with Aubrey from the Barden Bellas over leadership and musical direction. This conflict could drive the story forward as they both try to prove their way of doing things is the best.
Edward would be really interesting. His brooding and mysterious nature from Twilight would contrast sharply with the often over - the - top and energetic world of Glee. He could bring a sense of depth and angst to the Glee club. His musical talent, which was hinted at in Twilight, could be explored more fully in the Glee setting. He might struggle with fitting in, not because he's not talented, but because of his vampire secrets.
Fat Amy and Emmett would be a hilarious pairing. Fat Amy's over - the - top and fearless personality combined with Emmett's big - hearted and strong - willed nature. They could get into all sorts of comical situations. Maybe they start a side - project within the a cappella group or in the vampire world. Fat Amy could make Emmett laugh like no one else, and Emmett could protect Fat Amy from any threats, whether it's from jealous vampires or rival a cappella groups.
I think Santana from Glee and Alex from Supergirl would be great to focus on. Santana is sassy and confident, and Alex is strong and brave. They could get into some really fun arguments or team up to take on a common enemy. Also, Quinn from Glee and Lena Luthor from Supergirl could be an interesting pair. Quinn's transformation throughout Glee and Lena's complex character in Supergirl would create a lot of drama and potential for great storylines when they interact.
Beca and Finn from 'Glee' could be a great pair. Beca is this edgy, music - loving girl in Pitch Perfect, and Finn is the football player - turned - singer in Glee. Their different backgrounds and approaches to music could lead to an interesting dynamic. They could learn from each other and maybe even fall in love while working on a musical project together.
One idea could be a singing competition where the groups from both 'Pitch Perfect' and 'Glee' participate. They could start off as rivals, but then gradually learn from each other's styles. For example, the Barden Bellas could teach the New Directions some of their a cappella arrangements, while the New Directions could introduce more pop and show - tune elements to the Bellas.
Fat Amy is a great character to focus on. Her larger - than - life personality and unique sense of humor can bring a lot of fun to a fanfic. You could write about her secret talents or her family back in Australia.
Hinata would also be an interesting character to include. Her gentle yet strong personality and her Byakugan could offer a different perspective in the Killzone world. She might be more empathetic towards the Killzone characters. And from Killzone, Hakha could be a focus. His unique background and abilities could create some really complex and interesting storylines when combined with the Naruto characters.
I think Naruto and Spiderman are obvious choices, but also villains could be interesting. For example, Orochimaru from Naruto could team up with a Marvel villain like Doctor Octopus. Orochimaru might be interested in Doc Ock's mechanical tentacles and they could plot to take over both the Naruto world and New York. It would be up to Naruto and Spiderman to stop this unholy alliance.
Akagi would be a great character to focus on. His confident and sometimes over - the - top personality could bring a lot of humor and energy to a crossover. For example, if he was in a crossover with a detective anime, he might try to take charge of the investigations in his own unique way.
Definitely Naruto and Geralt. Naruto with his bright - eyed optimism and powerful ninja skills would contrast greatly with Geralt's brooding and more practical monster - hunting skills. Their interactions would be full of learning and cultural clashes. For example, Naruto might be shocked at how Geralt deals with certain 'monsters' that in Naruto's world could potentially be redeemed. And Geralt would be intrigued by Naruto's chakra and jutsu.