I feel like breaking it all down to you at the moment.
Assakura flood from the following things
- TMoHS threads
- Eyebrow fetish threads
- Knife enthusiast threads
- Canada threads
- Yandere threads
- Side characters who're better than the main characters threads
- Waifu threads
- Slut threads that end up featuring Assakura
Of all the TMoHS characters, Assakura has the most versatility, which is why you'll see more non-trolling Asakura threads than any of the others. After all, she IS the perfect woman, right?