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Because there was a huge complaint about the lack of monsters/subspecies in MH3, I had decided to dabble in what has been available for several years called "Texture Hacking". And this is long after I completed the Japanese game, BTW.
Character data was not modified in any way. Only a single "image file" was replaced. The purpose of these videos are to show what subspecies COULD have looked like because of a large demand & request to see them.
Obviously, you shouldn't hack your game data. However, since I bought the game, I personally believe I have a right to do what I want with it as long as it isn't for profit gain and does not harm anyone else's property.
All rights are held by Capcom, obviously. If they want me to take it down, I will. But they have not contacted me so far.