One common theme is loyalty. Jinx is extremely loyal to Silco, and this is often explored in fanfiction. For example, in many stories, Jinx will go to great lengths to protect Silco or carry out his orders, no matter the cost.
There's also 'Jinx's Redemption in Silco's Eyes'. This fanfic focuses on Silco's perspective of Jinx. It explores how he sees her potential and how he tries to guide her, while also dealing with his own ambitions. It's a really interesting take on their relationship.
Yes, there are quite a few. You can start by looking on Archive of Our Own (AO3). There are many talented writers in the Arcane fandom who have created interesting stories about Jinx and Silco's relationship. Some fanfics might explore their dynamic in the context of the show, like how Silco influenced Jinx's development.
One interesting fanfiction could be where Silco tries to protect Jinx from her own self - destructive tendencies. He might use his influence in the undercity to keep her safe while also trying to understand her chaotic mind.
AO3 (Archive of Our Own) is a great place to start. It has a large collection of fanfics for various fandoms, including Arcane which Jinx and Silco are from. There are filters you can use to narrow down your search specifically for Jinx x Silco fanfics.
Another way is to join fan communities dedicated to Arcane (the show they are from). On platforms like Reddit or Discord, there are often threads or channels where fans share and recommend their favorite fanfictions. You can ask for Silco x Jinx specific ones and get some great suggestions from other fans who have similar interests.
Some 'Silco fanfic' might be about alternate universes. In one such story, Silco could be a hero instead of a morally grey figure. He might use his power and intelligence to bring about positive change in Zaun in a completely different way than in the original story.
One major theme is trust. Since Silco is a complex character, the Reader has to navigate building trust with him. There are also themes related to the contrast between the light and the dark. The Reader could represent the 'light' in Silco's dark world, or they could be drawn into his darker side. These themes add depth and complexity to the relationship in the fanfictions and make for engaging reads.
You can try Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, including 'Silco fanfic'. Just use the search bar and type in 'Silco' to find relevant stories.