(Rewrite and Clannad spoilers) Touka Nishikujou is Kyou Fujibayashi. She was assigned to watch over prospective Guardian recruits like Tomoyo in Hikarizaka in 2003, and fell in love with Tomoya. Her hunter-type designation is what allows her to throw dictionaries with precision and force at Sunohara’s face, as opposed to the knives she uses for combat. She also got to live her dream as a teacher for Ushio’s kindergarten class, and used the captured familiar Botan for scouting and reconnaissance, which explains things like his “stuffed animal” mode - she’s cutting the contract.
(Air, Little Busters, and Rewrite spoilers) Kano is Midori, and Hijiri is the doctor that drugged Mio to release her. Unable to forgive herself for her sin, Hijiri keeps Kano around until she’s possessed by Mio into becoming one person again. Kano’s bandana is a shackle holding her from Mio, and only when Mio is helped by Riki can Kano take it off.
Note how the two skies are so similar; like two halves of the same whole.
The boy seen at the end of Air is Kyousuke, and the girl is Rin. They are freed from Kanna’s curse, and travel back to Hikarizaka from their vacation to Kami/Kasumi. Together with Kengo, who is Yukine from Clannad’s younger brother, Masato, and Riki, they form the Little Busters, now that they can experience all forms of love. Kyousuke, the reincarnation of both a Cutter-type Guardian agent (Ryuuya) and a Gaian summoner (Yukito) is both physically and socially exceptional, and being freed from the curse allows him to help others, like Riki.