Mordred is a homunculus baby thing made by Morgan using sperm from Artoria during that unfortunate time Merlin literally gave her the D, not in the way you might usually think.
Salter is just Artoria being infected by grail mud.
^That tag would lost is meaning/usefulness in less than a second for at least 99.98% of Yuri characters would fall in that category, which I can't decide if it's ironic or appropriate....both?
^ I mean the franchise seems to be leveling up with that every new series, Love Live OG = casual shipping, Sunshine = More explicit shipping, NijiGaku = soft yuri with a canon female MC from the game, so maybe Superstar = Supergay