DxD x Deku himself

To kill a bird

After the familiars, Rias gathered up everyone and said "ok guys... we shall transfer to a different area to begin training, Izuku I trust the other spirits in your mind have a regiment for you to do." Izuku only nodded in return as he then summoned his devil wings and proceeded to blast off once more as well. After a small while, he then got prepared and began to train with the help of his fsmiliars as he said to his sacred gear or Ddraig, "so Ddraig... How do I unlock my balance breaker." That is when he manifested and said through thr boosted gear, [I think it is a sheer want and or wills. Draw out your will and use it to activate the balance breaker and force out those emotions... GO FOR IT DEKU!!!] is all he said when Deku then prepared to engage as he began to activate his aura as Ddraig was amazed. He willed the sacred gear and his aura to manifest as finally it shouted out as Ddraig said [WELSH DRAGON: BALANCE BREAKER!!!] as he said that, the balance breaker appeared around deku with its famous red armor with green orbs. His power radiated a hole tone of energy as he growled his eyes shined a bright green as he managed to do so once more.

Deku then said throug Ph his balance breaker "holy shit this is amazing..." he then spread his dragon wings and devil wings before taking off once more using them to dash off and fly around testing his limits in the balance breaker itself. Izuku then went back to trsining to achieve the scale mail and surpass his limits.

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Ruby and the orc were now ready and sent to hell as they were there, a picture of Kuoh had appeared and it showed the home town once more. Home town advantage... Rias was thinking as greifa said "welcome... I will be the moderator for this game... here we shall begin now." Suddenly, the hole thing went on as Izuku said "I can take riser. I have sarpassed my limits and I want to see if he can push me even further." Is all he said as Rias said "very well. I shall send you off the rest you know the drill." Is all he thought before they took off and the announcements went off.

"Riser pawns retired."

Rias rook retired."

As this happened, Izuku smiled as he lifted his hand up and shouted "DRAGONS SHOT!!!" He then fired a shot taking out the entire gym with everyone located in it destroying the bishops in there completely.

"Risers bishops defeated"

"Riser queen defeated"

Suddenly, Deku saw Riswr and Rias fighting as Riser shouted "GIVE UP RIAS YOU CAN NOT WIN!!!" Before he could talk anymore, Izuku came in and kicked him hard in the face sending the Phoenix flying. Izuku then smiled manifesting the boosted gear once more and said "Ddraig... shall we kick us a birds ass?" Is all he said as Ddraig said [I understand partner... want to use balance breaker or not.] is all he said and Izuku said "no...Moët me treat him like a foe in training." Suddenly, he charged and dashed in punching riser and riser four back. Both punching and kicking one another as Deku himself continued to clash against him once more. After a small while Izuku said "I understand..."

As he said that, they all looked at him in slight confusion as he said "your power is like a regen quirk... it's not about out lasting... it's about over powering it quickly... BALANCE BREAKER!!!" As he said that, the boosted gear shined and shouted [WELSH DRAGON: BALANCE BREAKER!!!] and as he said that, they all saw the crimson red dragon armor around him, whip like tail and all with wings sprouting from his back as well.

Riser then said in a gobsmached expression "the red dragon emperor... why is..." suddenly, Deku in the balance breaker appeared and kicked him hard in the gut as Ddraig said [BOOST TIMES 20!!!] is all he said when Izuku shouted "OFA 20% SMASH!!!!!" Is all he said punching him square in the gut sending the poor bird boy flying into a wall once more as Deku then smiled as he kicked down the Phoenix from above as well.

After that, Izuku rammed into him from above and pinned him to the wall holding him by the head as he said "tell me Phoenix... Give up yet?" Is all he said before he tossed the bird boy away sending him flying even further away then before. Riser got up again and barely did so before Deku in balance breaker still, round house kicked him hard in the face sending him flying into a wall head first once again. Rias then looked up in shock as she said "Deku... what is this?!" As this happened, Deku smiled as he prepared a attack saying "O.F.A 100%... Delaware smash..." just before Deku could punch him, Ravel came in but he was ultimately two late as Izuku delivered the final killing blow on the Phoenix sending him flying away once again as well. Izuku then said "I'm sorry... I... I did not mean to..." he reverted from his scale mail tearing up as he did so with rias winning the game but to Deku... he felt as if he was unfit... he was unfit to be a hero and now... he was back at square one once more.

(Sorry if it is short and rushed)