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Midori SAITO (斉藤緑) appears to be (at least) three persons (all of these with a long "o" in their surname):

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斉藤緑 = SAITOU Midori (animator, Studio Wanpack)
(1 EDICT reading for 斎藤 = SAITOU; ANN has ca. 30 斎藤 persons, all "Saito[u]")
(4 EDICT readings for 斉藤 including SAITOU; ANN has ca. 30 斉藤 persons, all "Saito[u]")
(4 EDICT readings for 緑 = "green" including Midori; ANN has 9 緑 persons, all "Midori")
斎藤緑 (2004) Hanaukyo Maid Team: La Verite (TV) : Key Animation (D2_STATION)
斉藤緑 (2004) Elfen Lied (TV) : Key Animation (Studio Wanpack) (shirayuki)
斉藤緑 (2004) ToHeart - Remember my memories (TV) : Key Animation (shirayuki)
(keep) This is the current owner of this entry. (I set the kanji name here as I contributed two of the three credits.)
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斉藤みどり = SAITOU Midori (inbetweener, Kino Production)
(4 EDICT readings for 斉藤 including SAITOU; ANN has ca. 30 斉藤 persons, all "Saito[u]")
(1 EDICT reading for 斎藤 = SAITOU; ANN has ca. 30 斎藤 persons, all "Saito[u]")
(3 EDICT readings for 齋藤 including SAITOU; ANN has ca. 20 齋藤 persons, all "Saito[u]" except for one Kandou with "no source" for its kanji)
斉藤みどり (1996) Jigoku Sensei Nube (TV) : In-Between Animation (Playtown)
斉藤みどり (1997) I Dream of Mimi (OAV) : In-Between Animation (Kino Production) (livedoor wiki)
斉藤みどり (1998) Lupin III: Crisis in Tokyo (special) : In-Between Animation (livedoor wiki)
斎藤みどり (1998) Prince Mackaroo (TV) : In-Between Animation (livedoor wiki)
__________ (1999) Tenchi Muyo Movie 3: Tenchi Forever : In-Between Animation ("DVD credits"; JMDB has no low-level credits)
斉藤みどり (2001) Animation Runner Kuromi (OAV) : In-Between Animation (Kino Production) (http://www.yumeta.com/works/kuromi/kuromi/cast.html)
齋藤みどり (2002) Haibane Renmei (TV) : In-Between Animation (D2_STATION)
__________ (2002) Armitage: Dual-Matrix (movie) : In-Between Animation ("DVD Credits"; no entry in JMDB)
斉藤みどり (2003) Kochira Katsushika-ku Kamearikouen-mae Hashutsujo The Movie 2: UFO Shūrai! Torna : In-Between Animation (livedoor wiki)
斉藤みどり (2007) Shin Kyūseishu Densetsu Hokuto no Ken: Raoh-den Gekitō no Shō (movie) : In-Between Animation (Kino Production) (livedoor wiki)
斉藤みどり (2008) Vampire Knight (TV) : In-Between Animation (ep 3) (http://www.vampire-knight.jp/, unusable; better: livedoor wiki)
(split) Despite the varying kanji for the surname I consider "all of these" to be the same person.
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齋藤翠 = SAITOU Midori (colorist, Wish & EAGLES NEST)
(3 EDICT readings for 齋藤 including SAITOU; ANN has ca. 20 齋藤 persons, all "Saito[u]" except for one Kandou with "no source" for its kanji)
(8 EDICT readings for 翠 including Midori; ANN has 4 翠 persons, all "Midori")
_______ (1996) Case Closed (TV) : Finish Animation (Wish) (livedoor wiki has low-level animators only for a few episodes)
_______ (2003) Early Reins (OAV) : Final Line ("English Credits"; no source found)
齋藤翠 (2009) Fullmetal Alchemist: Brotherhood (TV) : Digital Paint (Wish) (D2_STATION)
齋藤翠 (2009) Chō Gekijōban Keroro Gunsō Gekishin Dragon Warriors de Arimasu! (movie) : Digital Paint (Eagle Nest) (livedoor wiki)
(split) And this is certainly a different person.
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