Another one is 'Lyoko: A New Beginning'. This fanfic focuses on the very start of the characters' journey on Lyoko. It doesn't have too many complex plot twists and is written in a very accessible way for those new to the Code Lyoko fanfic world.
You might also enjoy 'Discovering Lyoko'. It gradually unfolds the concept of Lyoko and the adventures that await the characters. It's not overwhelming and is a great way to get into the groove of reading Code Lyoko fanfics.
One great Code Lyoko fanfic is 'A New Threat on Lyoko'. It has an interesting plot where a new enemy emerges on Lyoko, and the gang has to figure out new strategies to defeat it. The characterizations are quite on point, making it a really engaging read.
Well, there's a fanfic called 'Odd's Discovery'. In this one, Odd realizes some new aspects about his relationship with Ulrich while they are on a mission in Lyoko. Also, 'Ulrich and Odd: Beyond Friendship' is quite interesting. It starts with their normal school days but then gradually shows how their bond deepens in a way that goes beyond just friendship. There's also 'Code Lyoko: Odd and Ulrich's Adventure' which is full of action and at the same time shows their growing connection.
Code Lyoko is an animated series. It mainly follows a group of students who discover a virtual world called Lyoko. They have to fight against an evil artificial intelligence named XANA. They can 'virtualize' into Lyoko to combat XANA's various threats to the real world.
Well, a great Code Lyoko fanfiction idea is one where the group accidentally brings something from Lyoko into the real world. It could be a virtual object that starts causing chaos in the school or the town. There are also fanfictions that rewrite certain episodes from a different perspective. For example, from the point of view of a minor character who was in the background during the original episode. And then there are those that introduce a new character who has a special power or ability related to Lyoko, and how that character either helps or hinders the main group's fight against XANA.
Well, there could be a story about Odd and his crush on Sissi. It might be a comical love story. Odd is always getting into silly situations because of his attempts to get Sissi's attention, like when he tries to show off his skills in the virtual world of Lyoko just to impress her.
The main characters are Jeremie, he's the brains behind a lot of the tech stuff. Then there's Aelita, she has a special connection to Lyoko. Ulrich is a good fighter, Odd is kind of the fun - loving one, and Yumi is also very capable in combat and decision - making.
One idea could be a story where William, after being rescued from XANA's control, has trouble fitting back into normal life at Kadic. Yumi could be the one to help him through it, and during this process, they discover new feelings for each other. Maybe they have to face some remnants of XANA's influence together, which makes their bond stronger.
The first place to check is Archive of Our Own (AO3). It has a very organized system for categorizing and tagging fanfics. You can search for 'Code Lyoko' and then narrow it down to the 'Odd x Ulrich' relationship. Fanfiction.net is also a reliable source. However, be aware that the quality can vary widely. You can also try looking on Tumblr. Sometimes bloggers will recommend or even post their own 'Code Lyoko Odd x Ulrich' fanfics or link to where you can find them.
One interesting 'Code Lyoko Crossover Fanfiction' could be a crossover with 'Sailor Moon'. Imagine the characters from Code Lyoko teaming up with the Sailor Scouts to fight a common enemy. The digital world of Code Lyoko and the magical world of Sailor Moon would create a really unique and exciting setting for a story.
Some popular platforms for fanfiction in general are Archive of Our Own (AO3) and FanFiction.net. They likely have a good collection of Code Lyoko fanfiction that you can 'watch' in the sense of reading and following the stories.