>More or less, but the question mostly remains of what his basic characterism would be.
Well, we've already sort of got hints that Bella and Will are fairly extraverted, and assuming Lynn's confidence issues are a thing (which, admittedly, isn't a given), she'd be a bit more introverted, adventurous but not one to work in groups so much. Rose, as the main character, would be somewhere in between, leaning towards 'Let's all be friends'.
So... if Cedric's the 'Intelligent' one, my guess is he'd be like Lynn, but instead of being adventurous he'd be more of a researcher. Lots of reading, nice enough guy, easy to approach but not one to approach others very easily. Book smart, basically, and given the rest of the cast looking the way they do, probably the least likely to get overly excited over something.
>Perhaps "introductory episode"? Or "establishing episode"?
That's the thing, though: the kind of episode I'm talking about isn't limited to introductions. Dragonshy was textbook example: everyone is given the same stimulus of 'Dragon threatening Ponyville', and they all react differently. You see how characters are defined by their differences, which is easier to do if the thing they're responding to is the same. The Gala fits that description as well. It shows off character traits, but it doesn't necessarily limit itself to showing new ones.
Maybe calling it a Band Episode would be better, or a Main Cast Episode, or a Role Call Episode.