Is it okay to use another player's character 'fantasia' as your own without asking?

[Lilseph]

D:

Well, most of this is straight creepiness. Though, I wouldn't mind if they copy my character. I must admit it really isn't that hard -.- I'm happy with my generic Au Ra.

There was one situation, however, where I copied someone's look. My retainer's look. I was messing around with a retainer fantasia and ended up creating a character that I liked more than my character. So I swapped appareances. No ragrets.