Don Dogoier

"Gokai Green!"

Don Dogoier (ドン･ドッゴイヤー), better known to the crew as "Doctor" (博士) is Gokai Green (ゴーカイグリーン) of the Gokaigers.

Biography
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Super Hero Taisen
When Marvelous takes control of Dai-Zangyack and leads them in battle against Kamen Riders, Don and Joe join with Daiki Kaito (Kamen Rider Diend), who is looking for Marvelous' treasure, and Hina Izumi, a friend of Eiji Hino (Kamen Rider OOO), in finding out. They eventually meet the crew of the time-travelling DenLiner.

Go-Busters vs. Gokaiger
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Super Hero Taisen Z
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Video Game appearances
Gokaiger had two video games released during its run, Super Sentai Battle: Ranger Cross and Kaizoku Sentai Gokaiger: Gathered Transformation! 35 Sentai!. Gokai Green appeared with his team in both of them.

Super Sentai Battle: Ranger Cross
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Kaizoku Sentai Gokaiger: Gathered Transformation! 35 Sentai!
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Personality
He is a pacifist who causes trouble because he wants to avoid fighting. When frightened, Don will cower behind either Luka or Joe, but mostly Luka, often resulting in an elbow to the stomach.

Bounty
His bounty is initially 100 but this is eventually raised to 1,000. This is then raised even further to 5,000. And yet further to 10,000. And again to 300,000, boosted due to his part in slaying Damaras, which is the same amount as Gai's bounty.

Portrayal
Don Dogoier is portrayed by Kazuki Shimizu (清水 一希). Prior to the series, Shimizu specifically said he wanted to be TimeGreen but not just because he liked Timeranger; his family was friends to the family of Masahiro Kuranuki, who portrayed Sion (the very first alien Sentai hero and another Green), and he wanted to do it in honor of him. Kazuki Shimizu also appeared as himself in A Day of One Hero, a mockumentary centering around his role as Don.

When Don and Luka switched bodies in Ep. 27: A More Than Usual Gokai Change, Don was portrayed by Mao Ichimichi (市道 真央).

As Gokai Green, his suit actor is Yasuhiro Takeuchi (竹内 康博), whose previous role was Gosei Red in Tensou Sentai Goseiger and later served as suit actor for Blue Buster in Tokumei Sentai Go-Busters.

Dub names
In the Korean dub of Gokaiger entitled Power Rangers Captain Force, which aired in South Korea, Don as with the rest of the first five Gokaigers keeps his name (likely because they are not from Earth and thus don't have normal Japanese names), while his Ranger designation is Captain Green.

Counterpart notes

 * Don shares a few things in common with 5 of the other Gokaigers in terms of counterparts:
 * He is one of three Gokaigers to not have a counterpart from every previous Sentai team, the other two being Ahim and Gai.
 * He is one of two Gokaigers to have all of their counterparts share the same gender as them, the other being Marvelous.
 * He is one of two Gokaigers to possess a ninja counterpart from a non-ninja Sentai team, the other being Luka. In Don's case, his is DynaBlack from Kagaku Sentai Dynaman.
 * He and Joe each have a counterpart played by Kenji Ohba. In Don's case, his is Battle Kenya from Battle Fever J.
 * He and Luka each have a counterpart played by Yukio Itou. In Don's case, his is Midorenger from Himitsu Sentai Gorenger.
 * He and Ahim share the same amount of different colored counterparts (4).
 * He and Gai share the same amount of Red Ranger counterparts (1).
 * Ironically, even though Don is a pacifist who serves as a comic relief, most of his counterparts (DenziGreen, GoggleBlack, DynaBlack, Green2, ChangeGriffon, Green Flash, Black Mask, Black Turbo, Black Condor, MammothRanger, ShishiRanger, NinjaBlack, OhGreen, MegaBlack, GingaGreen, GoGreen, GaoBlack, KabutoRaiger, Bouken Black, GekiViolet, and Gosei Black) were the "tough and serious guys" of their groups.
 * His comedic counterparts include Midorenger, Clover King, Battle Kenya, Green Sai, FiveBlack, Green Racer, TimeGreen, AbareBlack, DekaGreen, MagiGreen, Go-On Green, and Shinken Green.
 * Taiyo Sentai Sun Vulcan is the only Sentai team where Don does not have a counterpart.
 * 2 of Don's counterparts (KabutoRaiger and GekiViolet) are neither Green nor Black Rangers. Coincidentally, both of these Rangers come from post-anniversary Sentai teams.
 * 3 Green Rangers (DragonRanger, Shurikenger, and Confrontation Beast Chameleon-Fist Mele) and 6 Black Rangers (Black Bison, KingRanger, Black Knight, DekaMaster, Black Lion Rio, and Go-On Black) are not Don's counterparts.
 * Out of these, Don has only transformed into DragonRanger (17) and Rio (42).
 * While MegaBlack is technically the leader of Denji Sentai Megaranger and Don's main Gokai Change for this team, Captain Marvelous continues to act as figurehead whenever the Gokaiger change into this team. Out of all the Gokaigers, Don has the least amount of leader counterparts, as Joe and Gai have none.
 * However, in Ep. 34: Dream Comes True, Don as MegaBlack appears in the center during the Megaranger change.
 * Don is the only male Gokaiger to have any Additional Ranger counterparts, as all of Marvelous and Joe's counterparts are part of their respective teams' primary groups and all of Gai's counterparts are Sixth Rangers. Out of all the Gokaigers, he has the most Additional Ranger counterparts (Green Sai, KabutoRaiger, AbareBlack, GekiViolet, and Go-On Green).
 * He is also the only Gokaiger to have more then one counterpart played by the same actor. In this case, GoggleBlack and DynaBlack are both played by Jyunichi Haruta.

Gokai Change notes

 * Don is the only male Gokaiger who has transformed into more than one Extra Hero.
 * Of all of his forms, DekaGreen is Don's most transformed Green Ranger with 7, including his SWAT Mode. His most transformed Black Ranger was Battle Kenya with 5. DenziGreen, Green Racer, and GoGreen were his least Green Ranger transformations with one each. Black Mask, AbareBlack, Bouken Black, and Gosei Black are his least Black Ranger transformations with one each.