DIMENSIONAL PORTAL: Give Spiral a double power action, remove all of her Gateway markers from the map and place 2 Gateway markers on the map. Place one in an adjacent square and the other may be placed in any square on the map. Starting with your next turn, give a friendly character occupying the square of a Gateway marker a free action and place it in the square of the other Gateway marker.

my question is... can multi-base characters move thru the Portal?

As long as it is a legal place. ie: as long as there is enough square next to the portal for the multi-base figure to occupy

Thanks. it still doesn't make sense to me... but as long as that's the ruling i'm cool with it.