Quick answer — Reiko Iwasawa worked on Code Geass: Lelouch of the Rebellion (Color Design), Magi: Adventure of Sinbad (Color Design), Scrapped Princess (Color Design) and 12 more anime.
Reiko Iwasawa worked on Code Geass: Lelouch of the Rebellion (Color Design), Magi: Adventure of Sinbad (Color Design), Scrapped Princess (Color Design), s-CRY-ed (Color Design), Mysterious Girlfriend X (Color Design), Witch Hunter ROBIN (Color Design Assistance), A.I.C.O. -Incarnation- (Color Design), Mysterious Girlfriend X: Nazo no Natsu Matsuri (Color Design) and 7 more.