Disclaimer: I do not own Akame ga Kill! or Mortal Kombat. Those belong to their respective owners.
Epilogue: Tatsumi
When Shinnok returned from exile and attacked Earthrealm, Raiden set out to gather strong warriors who would stand against the Fallen Elder God.
The Thunder God found himself in a world rife with war and conflict between the downtrodden and the corrupted, with the most crucial battles fought by mighty individuals wielding peculiarly powerful weapons, Imperial Arms.
Further investigations led Raiden to the intrepid members of Night Raid. Through his status as a divine being, the Thunder God could perceive the innate nobility and heroic values the assassins possess. He then beseech Night Raid to join him in the fight against Shinnok, citing the Fallen Elder God as a greater threat than the Empire.
Night Raid initially refused the request, for their rebellion with the Empire was fast approaching final conflict, and the assassins numbers had been reduced significantly at this point with only for members remaining.
Raiden then proposed an arrangement. He would lend three members of Night Raid a portion of his godly powers, and in return, one of their strongest fighters will aide Earthrealm in resisting Shinnok and the Netherrealm Army.
After much debate and deliberation, Najenda finally acquiesced. She, Akame, and Leone will borrow the Thunder God's power. In exchange, Tatsumi with join in Earthrealm's fight.
Many battles took place between the opposing realms. And with every challenge that needed to be overcome, Incursio had to be forcibly evolved in order to bring its wielder victory.
In the final confrontation with Corrupted Shinnok, Incursio had evolved considerably to the point that the Fallen Elder God's corrupted power was easily overmatched.
Shinnok was destroyed at a near instant, but another threat still loomed. Bringing out the full potential of Incursio's power had forced the soul of the Danger Beast within the Imperial Arm to emerge. Tatsumi fell to his knees, as Tyrant's essence began to take over his body and manifest into the Danger Beast's new dragon form.
Within the Jinsei chamber, a loud cry of pain and fear rang out before it was drowned out by a booming roar. Suddenly, an extremely bright flash of light engulfed everything.
Tatsumi opened his eyes, and found that he was no longer in the Jinsei chamber or Earthrealm for that matter, but seemingly in a different plane of existence. As he contemplated whether he had perished and passed on into the afterlife, the young warrior saw his own body still remained albeit altered as it had completely fused with Incursio's demon dragon armor.
Several beings of light appeared before the Night Raid assassin, and introduced themselves as the Elder Gods. They go on to explain that, as Tatsumi was being consumed by his Imperial Arm, Raiden sacrificed himself with his remaining powers to burn away Tyrant's soul, before the transformation was finished.
With Tatsumi's consciousness restored and retaining all the power of Tyrant, the Elder Gods proposed an arrangement. The young fighter will take Raiden's place as Earthrealm's protector and uphold the balance of power between the realms. And in return, the Elder Gods will grant him one wish of whatever his heart's desire.
With no hesitation, Tatsumi demanded the resurrection of all who had lost their lives at the hands of the Empire.
Back on the hill where Night Raid buried and memorialized their dead, Akame, Najenda, and Leone looked on in astonishment when they were miraculously reunited with their fallen comrades as Sheele, Bulat, Chelsea, Lubbock, and Mine had appeared along with two others, a young girl named Sayo and a boy named Ieyasu.
As the joyous reunion gave way to confusion as to what made this miracle possible, a lone figure stood off in the distance. When everyone caught sight of the person, only Akame can recognize the young warrior clad in the draconic armor, and she called out to Tatsumi.
As all eyes turned to him in surprise, Tatsumi made a tearful smile and said farewell, then faded into nothing before anyone could react. Never again will Night Raid see their friend and comrade who championed all of good against the darkness.
With a new strength and purpose, Tatsumi now safeguards the newfound harmony of the multiverse against those who would disrupt the natural order. A task which will hardly ever leave the Sleeping Dragon God at rest.