Alex choose Backdraft, a support hero who works as a fireman his quirk is [Water Pump] which allows him to create water from the hoses that he has in place of hands.]
After deciding he created a bomb with a timer with [Creation] quirk.
And while hiding it went near a building full of people and kept it there.
While he was doing this things he had changed his appearance to Hitmoi.
He then went to a very far distance and started the timer with a remote that he created with his quirk while he created the bomb.
After few seconds the bomb blew up and many people got heavily injured and some were so scared that leaving all there work they started running.
The building that the bomb was kept in was on fire and after 20 or 30 minutes the fire fighters show up to extinguish the fire but in that the the fire had increased and was in process of making the buling fall but the firefighters show up and the person he is targeting showed up wearing a firefighter dress and having his face covered by the mask.
Seeing the first Backdraft used his quirk and and with the help of his quirk and the machine to spray water the fire stopped and the building was restricted to go instead as it was badly damaged and fault connection as it can electrify someone or the building may fall.
After sealing the buling with the tape and putting restrictions sign. They all got on the fire fighter truck that they came with and got back on it and went to there base again to wait again for saving lives and extinguish fire but unfortunately they never saw the light after that.
But when they were thinking of taking some rest after they reach there base to be with full energy then they heard a truck coming from the side and saw a person driving into the fire truck with a crazed smile.
And before they could menouvare the truck they got into a accident and the fire truck was slammed on the building on the left sideways and money people died from that crash.
Alex came out of the truck that hit the fire truck from the side.
When they were doing there job extinguishing fire Alex thoght of a better plan and went to find a sturdy truck and in no time he found it. He saw the owner of the truck sleeping while the truck was parked in a safe place but it will not be safe for long.
Alex approached the truck and without any warning broke the glass and killed the truck driver before the truck driver realised that he was.
Luckily for Alex the truck driver had a quirk [Strength]
[which from the knowledge of the driver can make a person using the quirk doubles the person current strength but if used for long time can strain or even damage the body very badly].
Alex was very pleased by getting a quirk like this from a truck driver. Other than that nothing was really that important with the driver so continuing his plan he took the truck and waited for the right time to slam it on the fire truck.
AND he waited for some time but the time came for him to slam it on the fire truck and so by putting the paddle on accelerator and putting an ou ther on break when he saw the speed on the speed box rising and almost reaching the max he put his leg up from the stop and then the fire truck got smashed to the wall beside them.
Seeing this without wasting a second Alex got of the truck wearing normal clothes that any person would wearing but unlike other people he was wearing a mask and had knuckles made of very strong materials that he created when getting of the truck.
After getting of the truck Alex walked towards the truck in a lazy motion for the people alive to get up and what he was expecting happened the people that were still alive got up but instantly they were punched in the face so hard that there head blew up. He didn't see Blackdraf but felt a attack coming his way so he used [Adrenaline] which gave him enough time to dodge. Alex thought the he must have been preparing a attack to make him unconscious.
Backdraft revealed his place and started attack with water but they were more compressed and small like water bullets and with the help ok of [Adrenaline] Alex was able to dodge most of them but a bullet hit him in the knee and Alex figured out that he was trying to immobilise him Alex rushed towards Backdraft and Backdraft increased the amount and Alex used his quirk [Object Attraction] to move object in front of him to block the water bullets.
Backdraft seeing this was a little surprised but without wasting time he used his horses and rinsed of using compressed water he used his maximum and created a huge jet which will not damage Alex but will surely thought him back but to Backdraft surpise when the water cleared he saw Alex coming at him.
When Alex with [Adrenaline] saw the attack coming towards him knew that it was not going to damage him but push him back and give Backdraft a chance to have more distance but Alex used [strength] and broke the street to make a temporary wall to black that attack.
If it was water bullets it would be able to penetrate the wall that Alex make but this was only for distracting so it didn't work and Alex increased his speed and reached near Blackdraft and with his quirk [Object Attraction] immobilized him and with [Strengt] punched him with his fool strength and it was doubled with the later quirk and Blackdraft was blow into tiny pieces as the impact with strength and taking it from point black range he was of no match with that attack but Alex wasn't unharmed either as his hand that he used to punch Blackdraft had all his bones broken.
Now he understood why the truck driver almost never used it until he is in a death situation as his body will not be able to take it. Luckily for Alex he was able to use [Strength] for the first time but without taking rest Alex was not able to use it second time.
After killing Blackdraft Alex looked at his arm that he punched Blackdraft with and looked around the damage he had caused and without wasting anymore time as th hero will arrive to check the ruckus anytime so Alex quickly used the ability [Predator] and absorbed all the flesh as well as all the metal parts and while he was absorbing Blackdraft he even absorb all the people that he killed.
He got all the components, memory, knowledge of all the people as they were all quickness. And only Blackdraft had a quirk as it is the reason he was the leader if this fire fighting squad. And lastly he got the quirk of [Water Pump].
But after absorbing so many people with a supporting hero Blackdraft he felt a arge to laugh at there death but he went inside a alleys to run before any hero starts chasing him.
But a Camara caught a photo of him getting out of the truck after causing accident so he was given the nickname "Black-Mask" to signify his black mask as they were not able to see his fight or any other footage as it was destroyed in the fight.
Alex took the Alley needed a place to hide or he can easily be spotted with all the blood he is covered with.
And Alex hid behind a wall and changed his appearance to that of Inko Midoriya and destroyed all the clothes, mask and knuckles and made some new clothes with a bag full of groceries and started walking toward the apartment where Inko now his clone lives.
After Alex started walking he saw a police car coming this way and was showing his picture of when he was getting out of the truck to all the people to find him as he will not be able to go far away.
The police also showed the picture of himself and Alex stopped himself from laughing and told them she has not seen it.
The police warned him and told her to inform whenever she sees him and Alex just nodded and told them thank you as they went to the other people to ask about his whereabouts.
And after a walk Alex finally reached the apartment of the old couple that now belongs to him.
He went inside and went to clear his mind and while he is busy sleeping lets look at Alex's copy disguised as Yuhiro who was doing all the work the original Yuhiro does and while he was busy doing it the head butler called in his personal phone and from what he knows the head butler never calls him in a personal phone if it's not urgent so he hurriedly picked up the call and said hello is there any problem and the head butler from the other side said...