Dark Souls Bonfire USB Charging Hub

I am wanting to construct a USB power hub that looks like the bonfires from the dark souls series for my brother for Christmas. I already have the coding (and it works) for the fire effect needed for the program, however, I do not know what size Arduino board I would need (the base is to have a circumference of 6 centimeters.) The entire thing will be powered by a standard wall outlet, but I would like for it to be fast charging capable and powerful enough for tablets or multiple devices. Any and all help is appreciated.