SONIC IS IN BRAWL! Pretty cool I suppose, he's a good fit. But how does he play? Well I'll do my best do describe that right now. First off, Sonic runs very, very fast. Sure, we all could've seen that coming, but compared to the rest of the cast he runs way faster than any of us could've guessed. Compared even the fast characters from the demo to sonic and they might as well be crawling. Sonic was one of the hardest characters at the event to actually control. Because of his amazingly fast running speed we had trouble at first almost just running past characters and missing with moves. Sonic's speed is a little bit awkward, he is an unwieldy character. Sonic's grab range seemed to be really high while dashing because of the amount of physical space he covers mid grab. His throws seem to have a fair amount of combo potential as well. He runs so much faster than any of the characters did in Melee comparatively to how the game works, his dash dance is incredible. Think of captain falcon's dash dance but faster and further. Did i mention how fast Sonic runs?
Let's move onto the rest of Sonic, since we've already talked about his incredible running speed. Sonic in the air isn't quite as fast as he is on the ground. In fact, in the air he's pretty average. Sonic RUNS the fastest, but I doubt I'd end up describing him as the overall fastest character. Sonic has some nice aerials, his forward air is like Pikachu's on steroids, he has an up air that acts a lot like Fox's old up air, his back air has a nice amount of knock back on it. One of Sonic's aerials had some really abnormal traits. Sonic's down air acts like moves we've previously associated with down b moves like Yoshi Bowser’s or Kirby's. Regardless of momentum, Sonic stalls for a brief moment, then shoots downwards foot first. Yes, this move DOES spike, and no, this move does NOT continue down until landing, it goes a certain distance and then stops. You can use this move to spike somebody off the stage and then recover, but the move goes down very far so you can't do it unless you are pretty high above the stage. This move is impossible to L cancel due to its bizarre characteristics. All of Sonic's aerials have decent rage and decent startup time, they aren't quite as fast as you would expect, but he does have enough power, he isn't the super fast but weak character some people expected.
I really liked Sonic's smash attacks. They all seemed very useful. His Up smash is a charged up spin attack that goes straight up and catches people, then releases them with quite a bit of knock back. It seems to have an awful lot of priority and can catch people out of a lot of different moves. Sonic's fsmash is a charged punch, it doesn't have an absolute ton of range but it's knock back is good. While charging sonic spins his arm around in place, its a humorous animation. Sonic's down smash has a lot of range and quite a bit of power, it's pretty similar to his up smash, but it hits on both sides. It has quite a lot of range and a good amount of power. Sonic's smash attacks aren't exactly the quickest, but they have a lot of power, priority and range.
Sonic's specials are almost all very similar visually speaking. All three of his b moves aside from his up b are all spin attacks. All of these spin attacks look and sound very nice. One of them is a homing spin attack with a large amount of startup time and a large amount of lag afterwards, one of them works like jigglypuff's old rollout without as much knock back, but it pops them up for a free aerial at some percentages. The other up b is more like Yoshi's Egg Roll but with more knock back and effectiveness since you can cancel out of it quicker. Sonic's Up B is a very peculiar move. Sonic's up b covers a lot of vertical distance, and it takes you a moment to gain your horizontal momentum back, so you wouldn't want to use it until you were pretty close to the edge. Sonic's up b is one of the only recovery moves that doesn't allow you to grab the edge in the middle of the move, you cannot grab the edge on the way up, only after you start your descent. Another notable difference between Sonic's up b and the rest of the cast is that after you use his up b you are still free to do aerials and some moves. Note that I said SOME moves. It appears that you can't do most of his b moves after this fall, or at least i couldn't get it to work, so using his up b then using his homing spin attack to get yourself to the stage seems to be impossible, you can however air dodge or do any aerials you want, which is a very nice option to have after already using your recovery.
Overall Sonic is a very good character, one of the best at the show from what we saw. He has a LOT of ground speed with some good throw setups, some interesting specials, good combo ability and plenty of KO potential, but he is going to take a lot of getting used to.