There's also 'Percy and Thalia: The Hidden Past'. This one uncovers some secrets from their past that they didn't even know about themselves. It's a long read but well worth it as it adds a whole new layer to their relationship.
There's a fanfic called 'Thalia and Percy's Adventures Beyond Camp'. In this one, they team up to go on a quest outside of Camp Half - Blood. The author does a wonderful job of capturing their personalities. Thalia's tough and independent nature combined with Percy's loyalty and humor makes for an engaging read. The story also features some interesting new mythological creatures that they have to face together.
A good Thalia Grace and Percy Jackson fanfic is interesting when it plays with their dynamic. For example, their different powers - Thalia's control over lightning and Percy's water - related abilities can create some really exciting battle scenes. Also, their shared history and loyalty to Camp Half - Blood can be explored in depth.
One common theme is friendship. Since they are both part of the same world of demigods, their friendship is often explored, like how they support each other through tough times. For example, in many fanfics, they help each other deal with the pressures of being a demigod.
A great Percy Jackson and Thalia Grace lemon fanfic also pays attention to the mythology aspects. Since the original series is based on Greek mythology, incorporating more mythological elements into the story can make it even better. The fanfic author could introduce new mythological creatures or use existing ones in a creative way that ties in with the relationship between Percy and Thalia and the 'lemon' content, if appropriate.
A popular one is 'Thalia and Percy: The New Prophecy'. It takes place after the main series and imagines a new prophecy that involves both of them. The story has a lot of action and adventure, and the way the author writes their interactions is really engaging.
I really like 'Thalia and Percy's New Quest'. In this fanfic, they are sent on a special mission that no one else could handle. The author does a great job of portraying their individual strengths and how they combine them to succeed. It's full of action and a bit of humor too.
One great 'Percy Jackson Thalia Grace' fanfiction is 'The Lost Sibling'. It delves into a scenario where Thalia and Percy discover they are long - lost siblings. The author does an amazing job of portraying their initial shock and then the gradual building of a strong bond. It has some really exciting battle scenes against mythical creatures too.
Some Reddit communities related to Percy Jackson might also have discussions about such fanfics. For example, subreddits like r/PercyJackson. People might post their own fanfics or recommend ones they've read. However, Reddit has rules about adult - like content, so if the 'lemon' implies something more mature, it might not be openly shared but you can still find great non - explicit fanfics there.