For me it's Dan Knights by a long way:
- First world champion of the modern era.
- One of the first persons that practiced the Fridrich system and developed it to a high level (16 seconds) and he had to do that almost all by himself.
- Shared that knowledge by building the first website that explained in plain English how to solve F2L, perform fingertricks, learn algorithms, etc.
- The buzz I got from watching his videos 6 years ago is still the main reason why I'm cubing now.
- A true sportsman: great temperament and competition attitude, always behaved well when among other cubers, no sign of pretension at all. Just a really nice guy.
- We all owe to him.
- I miss him.