The Shrieker Character Information:

In the Kanto Region, Fighters from all around are in a battle between street fighting tournaments and gang war and re-enacting a what can be described as a war between the greatest warriors, generals and strategists in Chinese history are battling against each other in a reincarnation between Fighters alike.

And...

...
Sexy...

...

Is that a giant black bird?

More than, why is it giving wedgies, spanking and stripping girl's clothes off?

Why is there even a bird here in particular? And what is it even doing interrupting the war anyway?