Therefore, only by plundering others, seizing their strength for oneself, is the path that most aligns with Casio's progression. Hence, the inevitable engagement in battle to sustain warfare has forged his boundless murderous intent and nature.
Casio, by nature, stands opposite to the Dark Creature Tribe.
Or rather, he inherently stands against all sorts of different creatures whose Life Fields differ from that of humans. He is always the sharpest blade for the human tribe when facing other beings; this is determined by fundamental interests.
In some ways, Casio is even more reliable than the three Saint Fists of Southern Dipper. If the Southern Dipper Three Fists are the protectors of mankind, a shield, then Casio is a serrated War Blade!
Regardless of whether Casio harbors any thoughts of protecting humans, no matter how selfish his motivations, he is in fact acting in alignment with human interests and can be considered the embodiment of human will.
