Webbecoming a demon doesn't change who he is, it twists him:

Have other characters tell him how good of a person he still is, in spite of him.

And when he is so strong that none of that.

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His ideals, his morals, his and motivation for seeking power were corrupted by muzan.

Webin this post, i'll use akaza as an example.

And in spite of.

How demon slayer absolves akaza of his crimes.

Webakaza being turned into a demon didn’t change who he was, it twisted him:

His ideals, his morals, his purpose for seeking physical strength at all.

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