One common theme is the exploration of different realities. Since Night Vale has such a unique and strange reality, when it crosses over with other universes, the differences and similarities in how they perceive reality are often explored.
One common theme is the clash of different realities. Since 'welcome to night vale' has its own very distinct and strange reality, when it crosses over with other shows or universes, the differences in how things work create interesting stories. For example, when crossed with a more 'normal' world like 'Gilmore Girls' (in some very creative crossovers), the contrast between the chatty, small - town normalcy of Stars Hollow and the otherworldly nature of Night Vale is a big theme.
One popular theme is the strange and otherworldly events that are characteristic of Night Vale. For example, fanfictions often explore the implications of the glowing cloud or the faceless old woman who secretly lives in your home. Another theme is the relationships between the characters, like the friendship between Cecil and Carlos, and how they navigate the oddities of Night Vale together. Also, the concept of the town's unique laws and how the characters either abide by or rebel against them is a common theme.
One common theme is the exploration of the unknown. Since Carlos is a scientist in a very strange town, and Cecil is the one who reports on all the oddities, their relationship can be used to show how they face the unknown together. Another theme is acceptance. Cecil is an accepted part of Night Vale, while Carlos is an outsider at first. Their relationship can be about Carlos being accepted not just by the town but also by Cecil on a deeper level.
One common theme is power clashes. Since different universes in crossovers have their own power systems, seeing how they interact is exciting. For example, in an Under Night and Skullgirls crossover, the different fighting styles and abilities lead to epic battles.
Love and mystery are common themes. The relationship between Batman and Vicki Vale often involves a romantic aspect, and at the same time, there's always some mystery going on in Gotham that they are both involved in.
There's also a 'Night Vale and Welcome to Night Vale' crossover fanfic. It delves deep into the shared universe aspects, exploring how different aspects of the two shows can co - exist and influence each other. It has some really creative plot twists that keep you hooked.
One common theme is the clash of different vampire cultures. In Twilight, vampires are more secretive and have their own set of rules, while in House of Night, vampyres are more open and have a different social structure. Crossover fanfictions often explore how these two cultures would interact when they meet.
Sure. One interesting 'welcome to night vale crossover fanfiction' is the one that crosses over with 'Twin Peaks'. It combines the surreal and mysterious elements of both. The author creates a world where the strange happenings in Night Vale interact with the equally odd events in Twin Peaks. Another great one is the crossover with 'Doctor Who'. It's really exciting to see the Doctor land in Night Vale and deal with its unique inhabitants and situations.
One common theme is the clash of power systems. Since Bleach has its spiritual powers and zanpakuto, and Fate Stay Night has magic and Servants, seeing how these interact is a big draw. For example, how would a Servant fare against a Hollow in Bleach? Another theme is the exploration of different ideologies. The characters in both series have distinct beliefs and values, and fanfictions often explore what happens when these collide.
In these crossovers, the theme of growth is quite common. Shirou starts as his normal self but through his experiences in the new world, he grows as a character. For example, in a crossover with the 'Naruto' world, he may learn new combat techniques and also gain more understanding of different kinds of power. Another theme is the exploration of new power dynamics. How his power compares to the powers in the new world, like if he's in the 'Bleach' universe, how his abilities stack up against Soul Reapers. And the theme of moral dilemmas also exists. He may face situations where the moral code of the new world challenges his own.