FATE/Stay Night
Loyal, independent and reserved, Saber seems cool and indifferent, but in fact she carefully suppresses emotions, concentrating only on achieving her goals.
Archer is sarcastic and cynical—but under his hardened exterior lies a complex and dark personality that unfolds throughout the story. Though skilled with ranged weapons, he can hold his own in melee combat.
Lancer is a fierce but balanced warrior who enjoys combating a worthy opponent. He has a playful attitude and takes a very carefree approach to life. Lancers are hailed as the "Most Agile" of Servant classes.
Rider summoned by Sakura Matou and Sinji Matou. No other description.
Assassin is entirely dependent on Caster for mana and cannot move freely beyond the grounds of the Ryuudou Temple. Furthermore, he lacks most of the usual parameters and abilities granted to his class.
Berserker is known to have three distinct Noble Phantasms, as shown on his status page. However, due to the enchantment that obscured his identity.
Caster is one of the physically-weakest Servants and relies mostly on her powerful anti-Army magic, she does less well in single combat.