A list of anime Koyasu Takehito-sama and Midorikawa Hikaru-san have worked together on (according to the Anime-Seiyuu Info Page):

Cowboy Bebop

Fire Emblem

Fushigi Yuugi

G Gundam

Gundam Wing

Legend of Galactic Heroes (The Golden Wings)

Saber Marionettes J

Saber Marionettes J to X

Shoujo Kakumei Utena

Slayers

Weiss Kreuz

Gee, guys. Like to work together, do ya?