I noticed that she did. But if I included manga only characters, I would have to think a lot harder about the list. LOL
On the other hand, here are some manga only characters that I can think of right away. (Again, in no particular order)
Ryo (Penguin Revolution)
Aya (Penguin Revolution)
Ren (Sweet Bite Mark)
Arou (Land of the Blindfolded)
Ahzeil (Dazzle)
Rikuou (Legal Drug)
Sano (Hana-Kimi)
Zess (Uragiri something something something)
Chisuga (Silver Diamond)
Blood (Koori no Mamono no Monogatari)
the Student Council president (Toumei Shounen)
Takashi Shinohara (Map of Tokyo Savage)
Taki (Yellow)
Goh (Yellow)
Eclipse (Demon Diary)
"Prince" (Desire Complex)
Kuoru (sp?) (Love Monster)
Gin (Love Celeb)
Ura (Mugen Spiral)
If a character in my anime harem list has a manga counterpart, chances are he's in my manga list as well.