Nero is a shiny ditto, but other than that is fairly normal.

Nero is kind and sweet, he tries to help others when he can. He hates to see people upset or sad and so tries his hardest to cheer them up however he can. Whenever he sees somebody alone he goes to be with them because he knows what it's like to be alone. Nero is very friendly to others and tries to make as many friends as he can. He is very honest with others although he won't be brutally honest. He tries his hardest to keep secrets that he has been told not to tell however it is not easy for him as he hates lying and normally it ends up with him telling the secret and somebody eventually ending up getting hurt one way or another.

Nero was born in Fiphele, a place where mist resides. For the most part Nero was alone, he had no friends. He had nobody to go to when he needed help, he had nobody to cry to when he was scared. He couldn't trust his own parents, they were criminals, they were liars. They lied to protect themselves and so Nero never felt like he got get along with them. Fiphele was like a never ending nightmare for him. Nero was attacked and bullied and his parents were of no help. He suffered through every day alone and did anyone believe anything he said? Of course not, because he was a ditto. A born liar they said, that was all he could do.

For a time, Nero was depressed. He didn't care anymore. He didn't bother fighting back the houndour or the gengar and haunter. He took the beatings, he took the insults, he took the bullying. He didn't care anymore, just like his parents didn't care. It was strange really, Nero found no desire to transform. He didn't want to, because everyone in his life, everyone he knew he hated. Nobody cared about him, nobody believed him, but that all changed one day.

He met a riolu once, his name was Comet. He saw just how depressed Nero was, he saw how sad he looked, how miserable he was, how lonely he was. Comet began spending time with him, trying to be his friend and at first Nero rejected the idea of friendship. It wasn't until Comet stood up for him against a group of houndour that liked to bully him because he was 'special' that Nero actually started to trust in him. Comet looked after Nero, he listened to him and he didn't accuse him of lying, not once. Instead he stayed silent and listened to Nero, allowing him to rant and shout and let it all out. Comet was there for when Nero cried, Comet was there when Nero was scared, He was a friend.

Comet then made a suggestion, how about they run away? Escape this nightmare and go somewhere else? Go somewhere where Nero felt safe for once, where he didn't have to worry every day, where he could make friends, where he didn't have to be alone. The two traveled with each other, looking somewhere that Nero liked, where he felt safe. Soon enough, they arrived in Invictus. For the first time, Nero felt like this could be a place where he could stay. Comet promised to stay with Nero for some time and he did, he kept his promise but eventually, he had to leave. He couldn't stay with Nero like he had hoped and that made him sad though Comet made him promise something. If he ever felt the way he did in Fiphele again, find someone. Find someone like him, don't stop looking until he found someone who cared. Before Comet left, Nero for the first time, felt a strong bond. He didn't want Comet to leave, Comet was his first friend, his only friend, and with that in mind, Nero transformed. He became Comet, a riolu. He wouldn't forget, he wouldn't allow himself to.