Princess Katsura

Princess Katsura is a title given to the female first-born child of the Katsura clan. The current Princess is Kasumi Katsura.

All Princesses of the Katsura Clan
Yuri Katsura (1st)

Unia Katsura (After Yuri)

Eclair Katsura (3rd)

Kurai Katsura (4th, Kasumi's mother)

Kasumi Katsura (5th, and current)

Current Princess
Kasumi Katsura is the current Princess. Since she is the Last Living Katsura her daughter would be the next, if she has one. If she does not have a daughter, then her son would be the first Prince Katsura, and if she has no children, she can claim someone else as her successor, even if they do not have her last name.