Here are Power Rangers who are alone in their battle against evil.

Gold Sith Ranger: Evil Ranger created for Cute Angel Ranger's fanfiction which can be found here: Power Rangers Lost Jedis.
Purple Power Ranger: Dean Atherton writes fic about MMPR the movie. He wanted to do this Ranger for his fic.
Red S.P.D. Ranger: Michael Esclavon wanted me to do him using Z's powers. Based on this picture.
Omega Supreme Ranger: Tom Ceuppens wanted me to do him as S.P.D. Ranger (face made by J. J. Wubs).

 

Scoobydoo Ranger: Robo Ranger wanted me to do this Ranger for him. I used head made by Hell Defender.
Magineptune: Majin form of Magishine. Based on this picture.
Magigold: Requsted by 12345. Magiranger with the power of horse.
White Tigersaurus Ranger: Blue Tiger Ranger wanted us to do him as a Ranger. Here is White Tigersaurus Ranger.
Weird Ranger: Based on this picture.

Shakuras Ranger: With her powers she has access to interdimensional gates and can travel through it. This allows her special
                            power suit. Maybe a new member of SG- 1 :)
Majestic Ranger: We saw one episode of Wild C.A.T.S and it inspired us to do this ranger.
Quantum Ranger: Quantum Ranger, who was on Power Rangers Time Force home videos. Based on this picture.
Angel Ranger: He must protect heaven against his archenemy Devil Ranger...
Devil Ranger : He wants to capture heaven and be it's emperor.

Gold Scarabeus Ranger: Ancient Ranger of Egypt.
Gold Ninja Ranger: Any other misguided ninja to go through pain and suffering ?
Dream Ranger: Look at this, just look at this. Ranger of your dreams is here. What do you think ?
Nightmare Ranger: Evil copy of Dream Ranger.
Royal Ranger: His powers can only use real king of an ancient kingdom, which he must protect against evil.
Gold Quantum Ranger: I played with some pictures and made this... He wears some protect armor.
 

Silver Megablast Ranger: the sixth Ranger to Power Rangers series based on Kagaku Sentai Dynaman. Based on this picture.
Silver Zeo Ranger: My brother recolored Gold Ranger and this is result.
Vampire Ranger: What happened if Vampire becomes a Power Ranger ?
Shadow Ranger: The real Shadow Ranger with the ultimate power of shadow.
Vector Ranger: One of the first pictures.
Silver Kryptonian Ranger: the sixth Ranger to Power Rangers series based on Hikari Sentai Maskman. Based on this picture.
 

Cyborg Ranger: Ranger who protects our page from evil viruses.
Red Zeo Ranger: Another version of Zeo Ranger V - Red. Based on this picture. Basic picture made by Eric Gonzalez.
Pink Dino Thunder Ranger: Just another Dino Thunder Ranger. Based on this picture.

  Red Militia Ranger: Based on Time Force or S.P.D. ? On both ? Based on this picture.
Indigo Cerberus Ranger: has the power of Ancient Dog. Based on this picture.

Shadow Shogun Ranger: Mystic warrior and Special Ranger of Thunder Ninja Academy. based on this picture.
Gold Turbo Ranger: What if Jason would be in Power Rangers Turbo ? Based on this picture.
Gold Turbo Ranger V2: What if Jason would be in Power Rangers Turbo ? Based on this picture.
Black Galaxy Ranger: Sixth Power Ranger from Power Rangers Lost Galaxy. Based on this picture.
Blue Alfa Ranger: A little modificated version of one of  Japanese heroes. based on this picture.
White Zeo Ranger: the seventh member to Power Rangers Zeo. Based on this picture.

Canadian Ranger: Ranger who came from Canada. Version with helmet. Based on this picture.
Blizzard Ranger: Ranger from frozen planet called Arctica.
Shadow Space Ranger: Doggy Cruger was rebel in battles of KO - 35. Based on this picture.

Orange S.P.D. Ranger: Boom as a Power Ranger. Based on this picture.
Blackbird Ranger: Based on this picture.
Gold Ranger: He uses all Tommy's combined powers. Based on this picture.