One common theme is friendship. Lydia and the OC Sisyet might form a strong bond, either through facing the supernatural threats in Beacon Hills together or just by being classmates. Another theme could be love and romance, perhaps Sisyet has a secret crush on Lydia or vice versa.
Power and control is another theme. Maybe Sisyet has some unique power that they need to learn to control, and Lydia, with her own abilities as a banshee, can offer advice or assistance. There could also be themes related to family. Sisyet might have a complicated family situation, and Lydia's own family experiences (or lack thereof) can create an interesting dynamic between them.
The theme of self - discovery is also quite prevalent. Sisyet, being an OC, often goes through a journey of finding out who they are in the world of Teen Wolf, and Lydia can play a role in that, either as a guide or a source of inspiration. Also, the theme of dealing with the supernatural is common. Since Teen Wolf is all about the supernatural, Sisyet might have to learn how to handle werewolves, banshees, and other creatures, with Lydia's help.
Try Reddit as well. There are subreddits dedicated to Teen Wolf. You can post a request asking for Lydia Sisyet OC fanfics, and chances are, some fellow fans will point you in the right direction. Additionally, you could follow some Teen Wolf fanfic writers on Twitter. They often promote their works, and you might come across the type of fanfic you're looking for.
One common theme is power dynamics. Since Peter has his own power in the Teen Wolf world, when an OC is introduced, there's often a play on who has more power or how their powers interact. For example, an OC might have a power that either complements or challenges Peter's.
One common theme is self - discovery. Male ocs often come into the Teen Wolf world not fully understanding their powers or place, and they have to figure it out. For example, they might discover they're a new type of werewolf or have a special ability.
One common theme is the struggle of the oc with the unexpected pregnancy. They often have to deal with the reactions of the other characters, like shock or concern. For example, in many fanfics, the pack members might be initially taken aback by the news.
Yes, in the fanfic community, there are various themes explored, and 'Teen Wolf' has a large enough fan base that gay sex-themed fanfics do exist. However, not all fans engage with or are interested in this type of fanfic.
Another theme is self - discovery. Since Scott is a complex character in the Teen Wolf series, fanfics often focus on his journey of finding out more about himself, his powers, and his place in the world of the supernatural.
Friendship is probably a common theme. Sisyet might make new friends on his or her adventures, and these friendships help Sisyet get through tough times.
Self - discovery is another prevalent theme. Writers like to take Lydia on a journey where she learns more about herself, her strengths, and her weaknesses. This can be through facing challenges or having new experiences in the fanfic world.
Growth is another theme. In fanfics, we can see Carl and Lydia growing as individuals. For example, they might learn important life lessons like the value of honesty or the importance of perseverance while they are on their adventures or in their daily lives.
A theme that often pops up is self - discovery. Lydia, through her interactions with Beetlejuice, discovers more about herself, her own power, and her place in the world. Also, the theme of acceptance is there. Beetlejuice, who is often ostracized, finds acceptance from Lydia, and vice versa.