Sideview battlers are generally centered horizontally, and grounded at their feet. However, not all sideview battler spritesheets work this way. In the event you have a sideview battler that doesn’t conform to those standards, you can ‘anchor’ them a different way.
This sets the anchor location for the actor’s sideview battler at y.z. By default, the X anchor is 0.5 while the Y anchor is 1.0. If you want the X anchor to be a bit more to the left, make it less than 0.5. Make it more than 0.5 to make the X anchor more towards the right. To raise the Y anchor, set the number value to less than 1.0. Keep adjusting until you find that perfect anchor setting.