Yes, he does count as Seriously Good, but just BARELY. He has tons of lighthearted moments like how he usually acts in Modern Sonic games, especially Frontiers, where he is the least serious of him, Amy, and Tails, and him just hanging around with Sonic and friends. He only really got serious in Adventure games, though, because in games like Sonic 3, he was not hard to laugh at, especially with how he foiled his own plan to get in the way of Sonic and Tails in Launch Base.