Are your characters doing weird scale things in Unity coming from Maya? It's probably the Segment Scale Compensate on joints causing your problems. Segment Scale Compensate is on by default every time you make a new joint. You can learn more about Se

remove_scale_compensate

{
string $selected[] = `ls -type joint`;
select -r $selected;
}

string $sel[] = `ls -sl`;
string $singleJnt;
for ($singleJnt in $sel)
{
setAttr ($singleJnt + ".segmentScaleCompensate") 0;
}