Wanted to get a visual down for Dan's height in comparison to other Sonic chars. I thought Sonic himself is a good baseline for the "average" height of an anthro in that setting. Meanwhile Big is one of the tallest so putting them together made for a nice in between. Dan is meant to be a bit taller than average.
By the way, I kind of consider Big to be an atrocious character. Always has an awkward face and gaze, did nothing but fishing and was incredibly boring to play with. Not to mention they made him frustratingly dumb. I do wonder if he ever gets redeemed elsewhere?