Wouldn't say Loki turn more evil in the myths, that really depends on which Christian writer you read. The unknown writer of the poetic Edda show Loki as a trickster god. Snorri Sturluson choose to use Loki as antagonist in his prosaic Edda. Saxo thought all the gods were evil, but mostly ignored Loki and just wrote him as an annoying joker.
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Wouldn't say Loki turn more evil in the myths, that really depends on which Christian writer you read. The unknown writer of the poetic Edda show Loki as a trickster god. Snorri Sturluson choose to use Loki as antagonist in his prosaic Edda. Saxo thought all the gods were evil, but mostly ignored Loki and just wrote him as an annoying joker.