Answer:
I am the yellow hem of the sea's blue skirt.
I have one eye. See near and far. I hold the moments you treasure and the things that make you weep.
My first master has four legs, my second master has two. My first I serve in life, my second I serve in death. Tough I am, yet soft beside. Against ladies cheeks I often reside.
i'm popular for Knuzlocks what am i
I drift forever with the current down these long canals they’ve made, Tame, yet wild, I run elusive Multitasking to your aid. Before I came, the world was darker, colder, sometimes, rougher, true. But though I might make living easy, I’m good at killing people too.
I have feet on my head
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What am I?