Well if we're strictly talking about self made income then Gates and the other top forbes list will be in it. But if we're talking about juat plain old cold cash and asset then i would guess the saudi princes and sultans with oil fields to their names. Rothschild and other conspiracy theory families and corrupt officials.
Just bitcoins or in general? I think some obscure countries president is probably the richest person in the world, they do not posses maybe the most amount of money in dollars but controlling a whole country the way you want to and just doing whatever you please must be richer than just having a lot of money.
Bill Gates and Warren Buffet combined with Jeff Bezos can't come close to people like Putin for example, dude has power to do whatever he wants without any backlash at all.
Which means power is always more valuable even in economics than money itself. However if we are talking about bitcoin only than I suppose satoshi must be the person with most amount, I mean he was the one who started this all and he was the one who mined during the early days and gathered a lot of it first.