The World's most Overpowered Side-Character

Sirens started going off all across Zola-Prime as the remnants of Hāl began crashing toward them.

"Are we safe here?" Dina asked resting her hand on Ikaris and waking her from her stupor as her eyes returned to normal while she turned to greet evereyone's gaze.

"Many of us here are capable of keeping ourselves safe now, as for those who are not, I will protect you, there is little to no demonic energy here on Zola-Prime, we are able to easily utilize our strengths." Ikaris answered, but looked behind again with slight worry.

"Almost all of the demon-gods have been killed now, the few that remain are the most powerful, they are stranded up there but if they find a way down here they will target the gods again, after all, my Love represents us as much as he does himself in his wrath."

"So..." Arla trailed off.

"We will retreat to the opposite side of Zola-Prime for now and keep an eye on the battle from there." Ikaris raised her hand, covering everyone in her divine mana and teleporting them all instantaneously.

With the system aiding her instead of her exerting herself and alerting the enemy of their presence she had already mapped the entire planet. Moving about was an easy feat.

"I never imagined I would see the day..." The Demon Lord looked around, his eyes were a light crimson like most other demons, and his skin was grey and ashen.

He had short black and wild hair with three horns on either side of his head and a pair of tusks on his lower jaw coming from the corners of his mouth.

Hāl was less than a fraction of its former self, with one side roughly crushed into smooth mountains, and the other side that was struck being almost completely flat, and it was at most a few miles of rock while everything else was debris floating away rapidly in all directions, on one end stood Sol, and on the other end stood the Demon-Lord and Saleos who had been spared from destruction, while floating weightlessly were a few demon gods who were capable of existing outside of an atmosphere.

"What a nice setting." Sol commented, walking along the rocky surface toward the only two still left there, his eyes and hair had returned to normal. "I never imagined I could comfortably destroy a celestial body the size of Saturn, the thought makes me feel uneasy, but considering my goal I'd say it's perfect."

"Your mana is at 79%" Sol heard a voice next to him, and turned his head with his brows wrinkled when he saw the system take physical form, he was shocked, she resembled Ikaris in beauty, but her body was more similar to Arla's, and her height was exactly at Dina's height, and then her features were a mixture of all three making her look completely different even though she looked like them at the same time.

The only variant that was completely hers was the dress she wore, it was what she found most comfortable which turned out to be a tight plain blouse that stopped below her groin and apparently a short skirt it.

"79... Isn't it supposed to be 70%?" Sol asked staring at his status window as he walked, but while he walked he saw that number rise again by a percent and he began to chuckle at himself. "Hey, system, what's going on, why is my mana rising so fast, am I gonna explode?" He asked.

"Explode?" She leaned forward when he looked away from her. "No, I do not believe so; your mana is regulating because of Godslayer, it is a third party, not truly divine, not truly demon, the grey remember, you are your own universe." She answered his question.

"Also you have killed quadrillions, I simply decided the levelling-up notifications were pointless at this point, you are significantly stronger than before."

"I'm my own universe... Ikaris said the same thing, what exactly does that mean?"

"I do not have enough information on you or your history to create a proper response to that question." She answered looking down at her breasts that bounced per step. "They are quite heavy, mayhaps I should change the size... What say you, master Vestic?"

"What the hell are you doing, this is a serious-"

"But I need your opinion." She stared at him, her hair slightly glowed with blue like a healthy atmosphere, and her eyes were gold with black star-shaped pupils with four points, and her skin was a shade more tan than Dina's, with naturally pink and attractive lips; she was beautiful. "I need your immediate opinion." She leaned closer to him.

"Ugh." Sol stopped walking when he no longer needed to use any kind of magic to look at the Demon-Lord who had been standing patiently waiting. "Go away for now, I'll deal with you later." He pushed her cheek while she floated off the ground, giving him a bow and vanishing. "Now then-"

[Mana is at 90%]

"Is it infinite?"

[Possibly, but be sure to conserve your mana]

"Yeah... That's just not possible!" Sol raised his sword and turned the blade to his enemies just as a pillar of black mana appeared before him, even though with the [unbreakable] curse he was able to easily tear the attack apart the sheer force sent him trenching through the ground with his feet leaving deep tears.

"Come now, destroyer... I allowed you to have your fun, I have listened to your grudge, and witnessed your power; you are strong, so I will fight you to avenge the dead, Sol Vestic of two universes."

"Avenge?" Sol looked around, sensing the approach of several demon-gods. "You watched them die, don't play victim with me." Sol started walking again, and then discarded his cape and broke into a slow sprint.

"Truly, I do not care, this realm bores me, I only want what you have."

"Which is?" Sol asked as he fell into a crouch watching the Demon-Lord do the same while Saleos took off running.

"Reignition of passion, and the will to fight, if you can sate my desire for warfare I will gladly die by your hand!" His lips peeled back into a grin revealing sharp teeth while Sol's frown only grew as he drew closer.

"Your existence is a stain, I'm not here to entertain, I'm here to kill!"

"Then do your best-"

[GODSPEED]

He was on the other side of the drifting remnant of Hāl but then all of a sudden he was right in front of the Demon-Lord with his sword curved as his first act was to take his head clean off his body... However.

"What ...the ...fuck?" Sol's eyes were wide when he saw a fist before him rapidly descending from the much taller being.

He couldn't dodge the attack, hell he could barely perceived it to begin with, it was a flash of black as the armoured fist slammed into the side of his head and blasted him through the ground causing him to emerge on the other side spinning out of control.

[The enemy has utilized gravitational magic]

As soon as he was alerted Sol felt himself falling again toward the debris.

"You easily destroyed my homeworld and have boldly threatened to destroy all life in my universe-" The Demon-Lord emerged from the hole Sol's body had made and caught his leg, spinning and tossing him faster towards the surface. "Prove that you were worthy!" He landed before Sol hit the ground and aimed to punch him again.

"Forced-" Sol spun out of the way of his fist and landed feet-first in his chest, "Sun!"

A gigantic blast of plasma appeared nuking the entirety of the drifting fragment and sending him cascading toward Zola, while he was falling through empty space he again sensed demon-gods approaching him, but their efforts proved fatal as Sol landed on a small rock the size of a car and held out his hand.

[Imaginary tier cosmic manipulation:]

He raised his hand and closed his eyes.

[Gama-ray burst, stacked]

A star-like phenomena appeared above him and from that object several pulses of cosmic mana hummed and whirred before long strings of cosmic energy wrged, faster than the speed of light they exploded instantaneously in every direction with one carving a clean hole through the side of Zola-Prime while the others annihilated every demon-god in hiding save for Saleos who had somehow dodged it preemptively, and the Demon-Lord who absolutely tanked it without issue as he approached Sol cackling.

"One of them is coming this way?" Arla looked at Ikaris, and the goddess nodded.

"Yes, the one who was protected by that thing, Sol might be unaware but he is headed directly toward us."

[It appears I miscalculated, the surviving demon-god is headed toward Zola, toward everyone-]

"He's incapable of winning against them." Sol answered the system launching himself like a spinner off the rock and building up momentum as he and the Demon-Lord approached each other.

"As long as this one doesn't reach Zola, they won't die!" Sol's momentum stopped when he struck the hand of the Demon-Lord expecting his sword to easily slice through his body, but gasping when it bounced off his palm before he was grabbed by his torso.

"Ha ha ha hah-"

[Imaginary tier creation magic...] The system calculated and then appeared next to Sol with her brows furrowed in concern. "This is not a good idea, creation is far more taxing than destruction-"

"It's not a request, I don't need you to tell me what I can and can't do!" Sol growled while grabbing on to the Demon-Lord's hand, and she stared at the maniacally laughing Demon-Lord and at Sol once more before vanishing with a huff.

[You never listen!]

[Imaginary tier creation magic: Clockwork; Reversal]

Sol's mana spread across everything catching hold of every piece of debris including the chunks that had already crashed on Zola and began rapidly dragging them violently back together.

[Mana output has risen to 30% mana has been drained by 50%]

[Enemy's mana output is at 2% mana capacity is unknown, you are at a massive disadvantage master Vestic]

[New skill unlocked; Planet]

[You are one step closer to completion]

"From this moment on..." Sol stared at the surprised expression of the Demon-Lord as an immense gravitation began dragging them into deep space while Hāl was being rapidly smashed back together behind him; his eyes inverted, and his hair turned white and began glowing as he shed his casual appearance again and released the last lock barring and suppressing his demigod mana.

"I'm going all out."