This is a hack that replaces Soma Cruz with Genya Arikado from Aria of Sorrow.
There are a number of other changes as well such as elements from symphony of the night being carried over such as,
The Alastor Soul has been replaced with the fully leveled Sword Familiar
The Imp Soul has been replaced with the Demon Familiar 
The Flying Armor Soul has been replaced with the Faerie Familiar
The Devil Soul has been replaced with the stone Gargoyle/Demon Alucard form from SOTN
The Final Guard Soul has been replaced with the Alucard Shield
And
The Balmung sword has been replaced with a weaponized version of the Sword Familiar fully leveled

This hack works with the Castlevania Aria of Sorrow US version of the game, it also requires a IPS patcher

Special credits goes to 

Julian/Jop for the Genya Arikado sprites
and
FanofDracula for the Devil Familiar,Fearie Familiar,Gargoyle Alucard, and Sword Familiar sprites

Enjoy