I found these characters in Brawl Stage files:
Ｂｏｘｅｓ ｔｈａｔ ｓａｖｅ！
The letters above are the unicode "full width" versions of our beloved ascii characters. They live in the 0xFF__ region. I convert them to ascii by taking the second byte and adding 0x20.
There is also an "ideographic space" (0x3000) in between the words above.
So if you ever get spam from Asia with these weird characters in them now you know what they are.
- Full Width Unicode Characters