The Flash Pair are 17 years old and both stand about 5'3" (give or take half an inch). It is less clear what their costumes should look like, since they differ considerably between the novels and the anime.

 

(left) color frontispiece for the Daatipea Flash manga by Makihara Hisato

(right) color frontispiece for the Daatipea Flash DX manga by Oono "Takemaru"

both were published in 1996

 

covers from seven doujinshi:

the artist is "Capt. Kiesel"

 

[right] from AB Laboratory (1998)

 

back cover

from Kaishaku (1994)

 

[left] produced by the Flash Project Circle (1994); [right] this one contains a Kei-solo story

 

this last one only presents the Angels on its cover