We all know the twins and eye-lost are two themes that CLAMP loves. So lets make a list of each and see which is more popular.
Let me know if I've forgotten anyone.
btw, the lists below contains spoilers for pretty much every CLAMP manga but especially for TRC 178.
And I'm only counting mangas. No Drama CDs (since that's just fun crack) and no animes (because I know the MKR anime gave Presea a twin but if CLAMP really wanted her to have a twin they would have done it in the manga).
Twins List
1. A and C (Clover)
2. Chiho and Chise (Kobato)
3. Kazahaya and Kei (Legal Drug)
4. Yuuy and Fay (TRC)
5. Subaru and Kamui (TRC)
6. Clone!Syaoran and Real!Syaoran (TRC)
7. Clone!Sakura and Real!Sakura (TRC)
8. Elda and Freya (Chobits)
9. Akira's Mothers (Man of Many Faces)
10. Ashura and Tenou (RG Veda)
11. Subaru and Hokuto (Tokyo Babylon)
12. Ruri and Hari (Wish)
13. Maru & Moro (xxxHolic)
14. Soel and Larg (TRC and xxxHolic)
15. twin girls (xxxHolic)
The Lost of Eye List
1. Ginsei aka the evil bunny rabbit (Kobato)
2. Seishirou (TRC)
3. Yasha (TRC)
4. Fay (TRC)
5. Clone!Syaoran (TRC)
6. Real!Syaoran (TRC)
7. Seishrou (Tokyo Babylon/X)
8. Subaru (X)
9. Watanuki (xxxHolic)
10. Yasha (RG Veda)
11. Taishakuten (RG Veda)*
12. Kokuyo (Wish)
13. Hashimoto Kuniko (Tokyo Babylon)
14. Shashi's servants (RG Veda)
15. Doumeki (xxxHolic)**
*I wasn't sure if I should include Taishakuten or not since it was his 3rd eye that got slashed and have no clue if that was a permanent injury or not.
**Technically he did lose half of one eye and since Doumeki's awesome it'll be counted.
Twelve each, unless I've forgotten anyone. O_o
Fifteen each!