Dio

"ALL I WANTED WAS SOMEONE TO CARE FOR ME! SOMEONE TO ACTUALLY MAKE ME FEEL GREAT. BUT NO! YOU CAN ALL GO FUCK YOURSELVES!" - Dio before collapsing over 9 buildings.
Dio is Auxicom's favorite OC, He is a fallen angel who was banished to earth thousands of years ago. His goal is to try and absorb all powers around him to overthrow God, He had absorbed half the sirens powers, and was able to successfully use them to win a fight against an army of angels.
Dio's power focus is mainly his advanced social influence skills, being able to manipulate crowds of over 1,500 people, and was able to blow up one of the biggest empires of all time. He can also use this against people, and make them turn on each other. This is a huge threat as it causes civil wars, wars in general, chaos, and violence.
As absorbing the Siren's energy, the same goes for him. If he starts to sing or whisper in any manner, he will be able to hypnotize thousands of people at once. Dio uses his powers to multiple advantages. And his longevity makes it worse, as he was banished when he was 13, he still looks 13. His confirmed real age is over 15,000 years old. 
Once people get to know Dio, they may notice that he won't help them with any activities, trip them up and laugh, or just bully them for the fun of it. His super strength doesn't help this either. As he was able to throw multiple of his "friends" down stairs, breaking their legs or severing their arms.
Dio also is successfully able to transfer peoples blood, organs, etc into his own using nothing but his mind. Doing this, he was able to kill multiple people.