No it doesn't make any difference at all what size you are, remember even small ants pack a punch
Captain Lightspeed lvl 50 kin/psi def.
Anything done in the costume creator has nothing to do with powers, in the way you described
The rize to the challenge power works sort of like the invicibility power of the invulnerability set. the more foes around u type style. often i have 8-12 mobs around me yet i only have 4 stacks of rize to the challenge, im not convinced that size of my character doesnt have impact here. anyone accually tested this?. cheers.
Look at it the other way. If you make a big character, more foes can stand around you attacking. A max-sized huge character could easily have 6-8 (or even 10) attackers around them. A small character can have, maybe, 4 around them before the others have to stand back and may be out of range. Circumference grows with the square of your character's radius, so it is actually more logical that a bigger character should have more attackers in range.
I'll try to look at the figures sometime, but it's hard to keep focus on it in a combat with that many mobs attacking (and stay alive).
Disclaimer: The above may be humerous, or at least may be an attempt at humour. Try reading it that way.
Posts are OOC unless noted to be IC, or in an IC thread.
The radius of the power is 8', measured from the centre of your character. It is possible that a large character occupies slightly more of that area, and hence can fit in fewer mobs. It caps at 10 though, and so long as you are not fighting very large foes you should be able to fit 10 into the aoe.
I really should do something about this signature.
id really love some confirmation on the workings of the radius of rize to challange as it is sort of the top power in the set. other than making another char and lvling it to 16. but i might just do that if all else fails. cheers.
edit: well as it is now i jump into a pool of mobs in a 8man team, get 4stacks of rttc, when i should be getting 10 
Maybe i could get ahold of a shrinkray somewhere ? =)
My Claw/WP scrapper is much smaller than my WP/Fire tank and both can have the full 10 in their radius.
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
yeah i found out that it was much less of a concern than id previously thought. was fighting mostly huge enemys at the time turned out 2 be the issue.
hello, i rolled a ss/wp brute a while back, and after using rize to the challenge power id come 2 ask myself, does the size of my toon have any impact?, as i noticed that i usually get 4-8 stacks of it and sometimes for a split second 12ish(mostly 4ish), i made my toon as big as possibly typical brute style, but it left me thinking had i rolled a tiny toon would i get more stacks of rize of the challenge cus theyed get more mobs closer 2 me?. anyone have any experience with this?. cheers.