Its not like its the first time.

The original Kite (unnamed - Boy) appears on IMOQ and LINK
The 2nd Kite (Shuugo - Boy) appears on UDEDEN and LINK
The 3rd Kite (Azure - AI) appears on GU and LINK
The 4th Kite (Sora - Girl) appears on LINK and is set to appear on the 4th Generation of 'The World' two years after LINK.
The 5th Kite (Sakuya - Girl) appears on QUANTUM