You could view some examples of hitbox comparisons here:
http://wiki.shoryuken.com/The_King_of_Fighters_'98/Kyo
http://wiki.shoryuken.com/Kyo_02
http://wiki.shoryuken.com/Iori_Yagami_(KoF_'98)
http://wiki.shoryuken.com/Iori_Yagami_02
And there are more.
It’s a really sticky situation for KOFXIII for me. I pretty much helped with large portions of the KOFXIII wikis and gave my full love to KOFXIII in the beginning. Ultimately, I was burned by how dumb the game was. I feel that it’s to the point that SFIV does a better job at being SFII/SFA2 than KOFXIII tries to be 2002. Of course each SFIV and KOFXIII are their own games and should be merited and assessed as each their own.
By my assessment and interpretation, I don’t like what the game did. It’s not a good game for me, I expect better from the developers. The neutral game looks sloppier, and what was regarded as bad habits have become the norm. The game is to the point that I don’t enjoy it, I won’t play a game that I don’t genuinely enjoy. If there is discourse about the game, I will honestly chime in about the game. I love the game so much that I expect a higher standard and a better product. How I support the game is play KOF in general, grow my local scene, support non-local scenes by doing write-ups/writing wikis/gathering information/reviewing match footage/giving player feedback/making videos/and among many other means.
If it weren’t for the fact that Ash became the messiah and was planning to sacrifice himself for his onee-chan, I’d say Shen would be a valid protagonist, or at least a character to view the entire arc from. He’s been consistently in each of the protagonist teams from 03, XI, and XIII. Duo Lon dropped out of Ash’s team in XI and Ash is Edit select in XIII. Shen Woo has been consistently there, and consistently drunk.
Technically, SNKP said that there were multiple protagonists for the Ash saga other than Ash himself as I recall. If I remember correctly, one of the directors/producers said that Adelheid is a protagonist of the arc. To some degree, Kensou could be viewed as a protagonist.