i think the heyuri-iruyeh interaction is a lot like dante and vergil from devil may cry, except for the fact that they have swapped personalities: iruyeh is loud and mischievous while heyuri is calm and collected
like if heyuri had to have a weapon it would be a katana with which she slices enemies with never before seen precision while iruyeh would have guts' dragon slayer and cleave her way through while roaring

say something nice to iruyeh before she's sucked back into the evil abyss