Well, friendship is a huge theme. The fanfics usually show how their friendship is so strong that Asriel feels the need to protect Chara. Also, the theme of redemption can be there. Maybe Chara has made some mistakes in the past, and Asriel's protection is a way of helping Chara find redemption. It could be like he's shielding Chara from the judgment of others in the Underground. Additionally, the theme of family - like bond can be present. Even if they're not related by blood, they act like family, and Asriel takes on the role of the protector in that family - like relationship.
One popular 'Asriel Protective of Chara' fanfic is 'The Golden Bond'. It beautifully depicts Asriel's unwavering protection of Chara through various adventures in the Underground. Another great one is 'Protecting the Lost Soul' which focuses on how Asriel steps up when Chara is in danger from other monsters. There's also 'Asriel's Vow' where he makes a solemn vow to always keep Chara safe.
Friendship is a very common theme. Since Chara and Asriel are so close in the original story, many fanfics explore the depth of their friendship, how they support each other and grow together.
Yes, there are quite a few. You can start by looking on fanfiction websites like Archive of Our Own. There, you'll find a variety of stories exploring the relationship between Chara and Asriel. Some might focus on their friendship in the Underground, while others could be more creative interpretations of their bond, such as alternate universes where they have different adventures together.
Well, I know 'Shades of Love' which is a great 'Asriel x Chara gay fanfic'. It starts with their childhood memories and gradually unfolds their evolving feelings for each other. There are also some fanfics on websites like Archive of Our Own that you can search for under the relevant tags.
Common themes include loyalty. Chara and Asriel had a strong bond, and fanfics often showcase how loyal they are to each other, even in difficult situations. Another is the theme of discovery. They discover new things about themselves and each other through their interactions in the fanfics. Also, the theme of hope can be seen. In a world that can be dark like undertale, their relationship can be a source of hope, and fanfics play with this idea, showing how they bring light to each other's lives.
One great 'chara asriel fanfic' is 'The Golden Bond'. It beautifully portrays the relationship between Chara and Asriel. It shows their adventures in the Underground in a really creative way.
The 'asriel x chara fanfic' is popular because it allows fans to take the basic elements of these two characters and put them in various new situations. It could be in an alternate universe where things went differently for them, or it could be a simple exploration of their daily lives together. The fact that they are both such important and iconic characters in the game gives a lot of room for creativity, and fans love to use that creativity to tell different stories about them.
You can try looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfics, and you're likely to find some great chara x asriel ones there.