Battles

Malebolgia was fail on his own. Majin Buu wasn't immortal. Apocalypse has been put down by Black Bolt. Ergo Proxy isn't all that powerful. Most versions of Dracula aren't truly immortal or just aren't that powerful. The only Dracula version I can conceive as being enormously powerful is the Sacred Ancestor from the Vampire Hunder D novels. He was so powerful that even when moving as black clouds his consciousness was so immense that anyone caught under it as he passed over would be mentally crushed and killed by it. Never in the history of the VHD-verse has he ever been injured, except once; by his son, "D", in the 2nd novel "Raiser of Gailes".

dracula, why ?, night of wallachia, it is all your nightmare fuel mash up

Vincent Law (aka Ergo Proxy) is from the anime series called "Ergo Proxy". The Proxies are beings created to try and help mankind survive until the world heals and is capable of supporting life on its own. Proxies have some differing abilities, but all standard powers include immortality, regeneration, super-strength/speed/durability/senses, etc. They can't fly (though possible for some to glide and the only one who could fly was Monad-2). Ergo Proxy is a great series, but in terms of power-scaling it's pretty low.

which is weird considering the manga by the same author " blame"
 
have absurd weapons

Not really. Weapons in Ergo Proxy aren't much better than modern military technology. Sure some upgrades as their guns don't use gunpowder and they have some things that look like walker-machines with guns on them (not that big), but it's not far above what's currently available in terms of actual firepower. The only thing one of them came up with was a specific kind of bullet that could kill a Proxy and that's limited to; A) If it hits and B) if it strikes a vital area (ie Head or Chest).