Fujin made his first appearance in Mortal Kombat Mythologies: Sub-Zero, in which he played the role as one of the four elemental guardians assigned by Raiden to protect Shinnok's amulet hidden inside the Temple of Elements.
Fujin also made an appearance as a playable kombatant in Mortal Kombat 4/Gold. Once again he assisted Raiden, this time joining him in battle against Shinnok. After Shinnok's defeat, Raiden was promoted to Elder God and chose Fujin to succeed him as protector of Earthrealm.
During the events leading up to Mortal Kombat: Armageddon, he began to realize that Raiden had grown into a ruthless and uncaring God. When Raiden began commanding the re-animated corpse of Liu Kang, Fujin allied with Kung Lao in the hopes that the two could put an end to Raiden's madness. He also learns from Kung Lao that Johnny Cage was gathering the forces of good and of Taven's and Daegon's quest to defeat Blaze. Having been a friend of Argus and Delia for ages, Fujin decides to search for the two brothers to learn the true purpose of their quest.
In Mortal Kombat: Armageddon's konquest mode, Fujin confronts Taven outside the Red Dragon Clan's headquarters. Fujin tries to stop Taven, and the two do battle. Taven eventually emerges victorious.
Alignment:
Alignment: Good
Mortal Kombat 4

Better known as the God of Wind, Fujin joins Raiden as one of the last surviving gods of Earth. Their counterparts were defeated in a war of the heavens between Shinnoks forces and the Elder Gods. He now prepares for the final battle between the forces of light and Shinnok's hell-spawned warriors of darkness.
Mortal Kombat: Armageddon

It is unclear to me what has caused the transformation in our friend and ally Raiden. I have conversed with gods from other realms about the possible reasons for his madness. Rumors abound that he may have sacrificed himself to defeat Onaga. But if that were true, his energies would have dispersed and then reformed in Earthrealm. His spirit would have been reborn, having no memories of the past. He would have become a new god of thunder, neither good nor evil. Yet this new Raiden is dark, acting with a clear goal to defend the realm, but with the ruthlessness of Shao Kahn. What is more troubling is the enforcer he commands. Liu Kang's corpse has been reanimated and is selectively slaying many for reasons unknown. Kung Lao and I have joined forces to confront our former allies. If a way cannot be found to save Raiden and Liu Kang, I fear we will have no choice but to finish them.
When I first reunited with Kung Lao he informed me of a gathering called together by Johnny Cage. At the meeting, Johnny Cage described his encounter with Shinnok, the fallen Elder God thought to have been defeated years ago. I doubted his story. It seems unlikely that Johnny Cage would have psychic powers, and even less likely that he could have defeated Shinnok single-handed. But others present brought forth further evidence that something epic was taking shape. Most interesting was Kenshi's mention of the brothers Taven and Daegon. I knew them well ages ago. When they went missing, I questioned Argus. He would not speak of their whereabouts, but stated that they would bring about a new world. At the time I did not understand what he meant. But now it is becoming clear to me that whatever Argus planned is being corrupted by evil. As the others embark on this journey to defeat Blaze, I must intercept Taven and Daegon to hinder their progress and determine the true purpose of the quest. I only hope I am not too late.
Mortal Kombat 11

The God of Wind, Fujin serves the Elder Gods alongside his brother, Raiden, as Protectors of Earthrealm. Affable and lighthearted, he's adept at inspiring peoples' innate capacity for goodness and heroism to conquer forces of hatred and tyranny. Fujin believes Earthrealm's best days are still to come, and he fights to ensure that bright future.
Mortal Kombat 4

Fujin: Our forces of light have defeated Shinnok. Now, I must return to my duties as Earth's God of Wind.
ELDER GODS: You have served your element well Fujin, but we have a new mission for you.
Fujin: Raiden?
Raiden: Our battle with Shinnok's forces is over. I must move on to my new position as an Elder God. And you Fujin, you must take my former position as Protector of Earth.
Fujin: Raiden, it will be my honor to succeed you.
Raiden: Take special care of the mortals of Earth... they are a great people, but have the ability to self-destruct. Be patient and offer your wisdom and guidance.
Fujin: Farewell, Thunder God... I will not fail you.
Raiden: That is why I picked you.
Mortal Kombat: Armageddon

As the energy of Blaze coursed through Fujin, it transformed the wind god into a storm of justice. His power increased exponentially, he created a new realm from the shattered remnants of worlds that had fallen victim to Shao Kahn's aggression. From there the forces of Light will stage their operations, with Kung Lao as Fujin's commanding general.