#but as soon as he heard JL intention of containing the baby he jumped in

[nelkcats]

Baby Banshee

Halfa is just Danny's overall classification due to him being a human/ghost hybrid. However, if we go into what species he is classified into, he is a Banshee.

More specifically, Danny is a Baby Banshee. Although some consider that the Banshees are bad luck, in reality they usually scream to warn of great catastrophes. However, because Danny was just a baby ghost he was learning it now and had random impulses that led him to scream in the most random places, he couldn't control his wail.

Realizing how weird the halfa was (a male banshee, and a ghost baby at the same time), the ghosts decided to set him up with babysitters for when he went through his ghost childhood. Due to how powerful the child was he ended up being cared for by the Ancients. Which had no problem adapting to his needs and tried to keep him out of trouble.

On one of those occasions, Danny felt the urge to go in a specific direction. He ended up in a portal that guided him to the DC universe and wailed as loud as he could, which baffled the heroes.

He was obviously a child but had destroyed an entire complex with his scream and because of that they decided it was better to contain him. Danny was confused, he was warning them about the danger! Why weren't they listening?

Constantine understood what was happening instantly and warned the heroes to get away from the Banshee immediately. Hal mocked at the wizard's paranoia and encased the boy in a bubble. Which let out a cry when he was trapped and sent a danger signal from his core.

This ended with the Justice League facing off against obviously upset Ancients who were demanding their baby back.