I was wondering why Kirby (the Nintendo character) is written in Japanese as カービィ. Why isn't it spelled カービー? Furthermore, what is the difference between カービィ and カービイ? I've never seen the combination of ビィ before (or more generally, the use of a small ィ vowel after a character that already has that sound). Is this purely an arbitrary stylistic choice on the creators' behalf? Thanks in advance.