How far do you need to move to qualify for a charge attack when you're tiny sized?
same as anybody.
note that if you are using your normal Reach, you will have to move into the square of the target, and this movement counts as the distance of the charge, so effectively from NON-tiny characters' perspective, tiny characters SEEM to be able to charge from a closer distance, but it isn't a closer distance from tiny characters' perspective since they need to enter the same square.
I would have thought that 5ft would work for a tiny charge because they occupy 2 1/2ft space, otherwise they're having to move twice the distance, relative to them, to qualify.
Having said that, I guess a tiny creatures movement isn't any less than a small/medium ones.
Once you get smaller than a halfling or larger than an ogre, the size rules start to develop some holes. Its very mediumcentric. :)
