First off before anyone complains since I know there are a bunch of idiots who will probably complain alot I KNOW I didn't do too well and I KNOW this video could be alot shorter. Don't like it? Make your own video.
Now... I decided to try this for fun. I didn't think I would actually win and this was my first try... and decided to upload it. Why upload when I can do better? Mainly because it's not as short and people get to see how Roxas fights and such. Personally I hate Roxas. The way he moves is too slow, the way he fights is slow as well. He isn't a very good fighter. I really don't want to do this fight EVER again... Not with Roxas. Yes I used Donalds Limits as well. If I didn't use Donalds Limits it would be difficult to combo Terra since after 1 finisher Terra moves a bit far back and it's hard to catch up with him and keep comboing him. Also don't complain about the HP / MP bar. I made them to Proud/Normal/Beginners bar so that I could live. Of course it may be possible to do it with Critical Modes HP bar but I didn't bother trying. The level is STILL Critical Mode just edited the HP / MP bar. Roxas is also compatible with other abilities from Sora which you'll see in the video such as Glide.
Anyway enjoy the video.
Oh and one more thing since I know someone will say this. DW Roxas isn't any better than regular Roxas. He can't guard, He STILL isn't fast enough however you could probably easily throw big combos on him, I hate DW Roxas. Plus you'd have a hard time trying to block those lasers without Glide and such.