I can't claim to know about every kind of transformation. Especially not the ones from here. So maybe it really is that the magic here thought a dragon transformation was the most suitable skill for you. But typically it isn't that they alter your personality, but that you act different with new kinds of abilities. For example...if you suddenly gain a ton of power and strength, you might feel more reckless because you know you can handle it. A lot of S-Classes are eager to fight each other, but it's not because they're especially prone to fighting. It's just because they're really eager to test their skills against an opponent they're evenly matched against.

For a dragon transformation, it's worthwhile to consider if being a dragon is changing your thinking, or if you're just thinking differently in a different form because it's more suitable. You're more inclined to use the tool you have available to you in any form, like wings and claws and teeth. If you had additional skills you'd probably also make use of them, right?

[the longer he keeps babbling the clearer it is that he's just very interested in this kind of stuff]