Originally Posted by frogipoi
They are living creatures so they have personalities. Different types don't always mean different behavior. So basically your question is not thought through. Not to be rude in any way.
Actually, it is a good question. Many animals have different personalities based off of looks, in a way. Some dog breeds are obviously more aggressive depending on how they were bred. It someone wanted to, they could take the most aggressive crowntails, breed them over and over again to the most aggressive crowntails they could find, and then the type will have different, more aggressive personalities than the other bettas.
And just because you say "not to be rude" does not dismiss the fact that the way you phrased that statement was rude.
Edit: Forgot to answer the question myself ^_^ From what I've seen, there's no real defining personality among the bettas. Some deltas are violent, some are shy. Some veiltails are shy, others are violent. The only REAL type that I know of that are the same are the Kings. Most of them are reported to be very shy.