I, myself
俺 centers on the first-person pronoun 'I' or 'myself', used in informal, masculine speech to refer to oneself.
俺 combines the person radical 亻 with 奄, which likely contributes the sound. The character was adopted in Japanese as a first-person pronoun, especially in informal male speech.
A person 亻 beside 奄: imagine a rugged guy pointing to himself with his thumb, saying 'It's me, myself, I.'
For エン, picture yourself as the main character in an 'en'-dless story about 'I': en -> エン, and you are the protagonist.
I; me
we; us
you say tomato, I say tomato; (your) Goethe ("Gyoete") is whom I call Goethe ("Gēte")
"Mary Sue" protagonist (inexplicably strong or capable character)
me, me, me
we; us
we; us
my house
tomboy; boyish girl
I; me
I; me
my personal (e.g. opinion)
we; us