Blackrose stopped playing a while after the first 4 games. Rena ended up with a unique PC based directly on Blackrose's. The same applies to her brother who has a PC based on Kite's.
BlackRose and Rena have similer characters but they are still two different ones. Would have made for a great time if they had a chapter were the original Kite and BlackRose log in and bump into Shugo and Rena.