Berserker is a total sadist engrossed in sadism, seeking to perform atrocities and misdeeds upon all enemies who catch his eye. He is completely unmanageable due to Madness Enhancement, removing any means of self-restraint. Berserker possesses a fondness for both Roma and Nero even in his maddened state, allowing contact with either of them to possibly stop his rampages. His wish to the Holy Grail is "to get rid of his madness". If it could be granted, he would wish to return to that time when he was called a wise king, when he told stories to the child of his little sister, Nero, sitting on his lap... To that time, before the Moon Goddess fell in love with him and filled his body with madness.