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Alright, this is a spoiler character, but this does NOT contain ALL spoilers for the Cain arc.
It's segmented, so if you don't want to read it all you don't have to.
Meet Abel.
By the time Cain's arc rolls around, Abel has been dead for 6 years, making Cain 19 when the former died.
Abel is referred to as Cain's brother throughout the story, but his age is never specified. When he died, Abel was 11 years old. Not even a teen, let alone the same age as Cain. The fact that he murdered his own brother is bad enough, but Cain is also mortified that he murdered a young CHILD on top of that.
Throughout the arc, Cain is tormented by the Hisuian Zoroark that once belonged to Abel. This Zoroark takes on the form of it's deceased master and constantly watches Cain...