I'm fine with both of them as long as it's well-writing. But for innocent to become naughty later is negative for me. Maybe, it is because I play too much certain type of game too much to see how drastic flipped the character is. So, I trend to be cautious about this one.
(insert here the "both is good" meme) fr though i tend to gravitate more to the innocent looking ones that are secretly naughty (º﹃º) but either way I eat up the other variations too (innocent and stays innocent, etc.)
I like the innocent but secretly naughty type. The personality is a little bad, but it's not too bad. Occasionally, he likes to play little pranks and says some witty words. It's not really a traitor. But his appearance is normal and innocent. He can't see that he is naughty and cute inside.