There are also dororo and Berserk crossovers. In these, the brutal and gritty world of Berserk meshes with dororo's world. For example, Guts from Berserk might cross paths with Dororo and Hyakkimaru. They could find common ground in their struggles against the demons and the harshness of the world they live in.
There's also 'The Unspoken Connection' which focuses on the unspoken emotions between hyakkimaru and dororo. It shows how they grow closer in a very natural way, with detailed descriptions of their daily interactions and how those small moments build up their relationship.
The clash of different art styles is one interesting element. For instance, when dororo crosses over with a more modern - looking anime like One Punch Man. The detailed, somewhat dark art of dororo against the more simplistic, comical art of One Punch Man creates a visual contrast that can be really engaging in fanfiction.
Some 'dororo fanfic' are centered around alternate universes. In one such fanfic, Dororo and Hyakkimaru could be in a modern - day setting. They might be using their skills in a completely different way, like fighting against modern - day evils such as organized crime or environmental polluters.
One popular 'hitman crossover fanfiction' could be the ones where Hitman crosses over with Assassin's Creed. In these, you often see the two different assassin - like characters interact, with their unique skills and moral compasses clashing or aligning in interesting ways.
There's a 'felicity crossover fanfiction' called 'Felicity Meets the Legends'. In this one, Felicity somehow gets involved with the Legends of Tomorrow crew. It's interesting to see how her character interacts with the time - traveling misfits. Her logical thinking clashes and also blends well with their more chaotic ways.
One interesting arcane crossover fanfiction is 'Arcane Meets Harry Potter'. It creates a really unique scenario where characters from Arcane enter the magical world of Harry Potter. The author does a wonderful job of blending the different magical elements and cultures from both universes. It's full of unexpected twists and turns as the characters from Arcane adapt to the new and strange world of Hogwarts and the wizarding community.
There's also 'Mentalist and Supernatural Crossover'. This fanfic brings in elements from 'Supernatural'. It has the characters from 'The Mentalist' getting involved in a case that has a supernatural twist, which makes for an exciting read as they try to figure out things beyond the normal realm of crime - solving.
One great 'the incredibles crossover fanfiction' is the one where they cross over with the 'Big Hero 6'. It's really interesting to see the Incredibles' superpowers interact with Baymax and the gang's high - tech gadgets.
One place to find valerian crossover fanfiction could be Archive of Our Own (AO3). There are often various fanfics that combine the Valerian universe with other elements. Just search for 'valerian crossover' on the site, and you'll be presented with a list of available works.
One great Starscream crossover fanfiction is 'Starscream in the DC Universe'. It's really interesting to see how Starscream's character adapts to the DC world with all its heroes and villains. His complex personality adds a new dynamic to the existing DC storylines.