BUR #15881 has been approved by @nonamethanks.
create alias lelouch_lamperouge -> lelouch_vi_britannia
create alias nunnally_lamperouge -> nunnally_vi_britannia
I've no idea why we use Lelouch's fake name for his character tag. It's not a spoiler by any means, as it's revealed by him in the very first episode (which first aired 17 years ago). Also, he repeats his full real name ad nauseam when using his Geass to the point that you'd be forgiven for forgetting he even had a fake name to begin with.
All of this is also true by extension for Lelouch's sister Nunnally, so she's also included in the BUR.