[Nobodyman9]

Originally Posted by yezhanquan

If the fic itself doesn't have too many references to the duplicates having to interact with something solid, we can pull off the changes. But, if there are plot important points tied to the duplicates doing "solid" stuff...

Hmm, well...

Spoiler for fanfic spoilers:

Her Geass explains how she survived being stabbed by Rolo (her dying body was a doppleganger, which also explains how there was a body for the funeral) as well used for when Lelouch was stabbed (same). Plus, I think there's one or two other times she uses it. Also, when creating a doppleganger she loses the sight in her geass eye and in return is able to see from the doppleganger's POV. Another side effect is that whenever the doppleganger dies or is hurt she feels it as well only to a much lesser extent. So if a doppleganger gets stabbed in the chest, to her it feels like a hard kick to the chest.