Ambiguous tag.
For some potential artists named yu:
yu_* | *_yu
yu-* | *-yu
yuu_* | *_yuu
For some characters named yu:
yu_* | *_yu
yu-* | *-yu
yuu_* | *_yuu
For some copyrights named yu:
yu_* | *_yu
This tag is deprecated and can't be added to new posts.