The two people I know from Texas are an IRL friend of mine, and Revscarecrow. Neither of them really has much accent. Rev also knew Dave was from Texas going into his liveread (because people kept comparing them and he got annoyed), but he didn't give Dave an accent when voicing him either. I do not think it's a problem at all that Dave doesn't have an accent and I'm honestly kind of shocked it was that big a priority for many people because the regions of the US that each kid comes from are by-and-large absolutely meaningless in the text of the narrative. I mean, Dave has no central AC, one fan turned on and the window open in what the narration describes as a particularly warm day in APRIL. In fucking Texas??? He should be utterly soaked in sweat at all times.

Anyway, Colleen O'Shaughnessey is well-experienced and talented, I'm sure she'll do fine with Jade. It's honestly Toby whom I have no idea what to expect from. He's obviously talented in a lot of ways, even did vocals on some of his serious songs like Greatest Living Show (not that those are easy to hear, buried so deep in the mix), but this could be a Final Space situation where a Famous Internet Person in the lead role doesn't necessarily lead to a great performance.