If almost all characters in the Mahabharata and the Ramayana exhibited both dharmic and adharmic traits, why do their followers call some purely dharmic and others adharmic?

Hey, I'm not a hindu. But I started learning hindu epics like Ramayanaya and Mahabaratha. Going through some characters I learned that they all have good and bad in them.

Even the most dharmic ones have committed some sinful acts. And even most adharmic have done so much of big good acts.

But I leaned most of hindu friends I have frame some characters as 100% adharmic or 100% dharmic.

Why is that. Though I'm not so sure, I think those characters reflect our inner selves and show real human behaviours like us. And I believe we should get all the good from them and avoid all the bad.

Please explain if i have seen it wrong. Thanks.

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