I think people are missing the point somewhat. The main characters of each series, not just servants featured.
Stay Night - Artoria - Laser sword pew pew
Hollow Ataraxia - Angra Mainyu - Mostly useless
Prototype - Arthur - Laser sword pew pew
Extra - Nero - Giant theatre that lets her win
Extella - Charlemagne - Many flying swords
Apocrypha - Sieg? - Borrow Laser Sword
Grand Order - Mash - Laser shield? No pew?
Requiem - Voyager - Weird spacey powers
Basically, when it comes to main character servants, Okita is the first one whose abilities draw straight from her sword skills and speed and doesn't have a strictly magical aspect.