Blend Character Mirror Seams I've downloaded this Samus model from Modelresource.Com
(https://www.models-resource.com/nintendo_switch/supersmashbrosultimate/model/30947/ )
And the first thing I noticed was the horizontal and vertical seam lines on the waist and torso. I assume this is there the character has been mirrored but I was wondering how I would smooth them out or make them less noticeable.
Did you import the dae file?  I just took a look and it has a lot of duplicate vertices.  Select the model in object mode.  Go into edit mode.  Select all.  Then type 'm' for the merge menu and select 'by distance'.  That cleared up the seams for me.