Rowan_Eternal

After saving one world from a Demon God and earning the trust and devotion of a perverted goddess, Sol is rewarded with all his powers intact and sent back home with the goddess accompanying him as his personal slave. 
 
That was supposed to be the end, the Demon God was supposed to be his last great trial. However, they are both summoned once again to an even more doomed world, almost immediately after returning to Sol's. 

This time around, Sol refuses his role as hero.

Unable to find rest, he turns his wrath to the pantheon of gods in a spiteful quest to become the strongest being in existence, followed by his slave who took his place as hero. 
Battles await, secrets of old begin to scurry into the light when the world as he knows it begins expanding beyond the visible horizons of reality and deep into the fringes of eternal darkness.

Terrible consequences lay beyond the borders of the known.

The World's most Overpowered Side-Character

Both of them took off faster than the percievable, and then slowed once more at the core of the crater, Ikaris with an upwards slash of her sword and Dina with a downward strike of her spear.

"That was-" Ikaris's eyes widened just a second before impact and she clenched her teeth, grinning when she realised that Dina had made a perfect cast for the second time since they began fighting. "Sneaky little...!"

"I can't suppress her!!" Dina thought to herself staring through the blinding lights at Ikaris's expression slowly changing from shock to excitement again. "She's like a fucking planet!" The mage cursed, raising her heel and stepping on the spear, freeing one of her hands and pointing it at Ikaris beneath her.

Undefeatable.