“Oh, I would definitely suggest against leaving it entirely for me to decide. For no man can show as much a lack of restraint as I, Astolfo!” —Rider speaking to Sieg

Rider is known in his legend for being eternally optimistic and completely lacking in sense, and he can be called "curiosity in human form." As a Servant more concerned with the current prospect of a second life over all else, he is one who will, with or without permission from his Master, instantly leave when not in conflict to indulge in the pleasures of the world. He greatly enjoys physical form rather than the usual practice of being kept in spirit form except for battle, and obtaining permission to do so is enough to cause him to dance for joy. He is a frightfully unparalleled blabbermouth, prone to speaking on and on until those involved lose all rationality. His conversations, through no ill intent on his part, have a way of meandering toward maximum social awkwardness. His hobby of adventuring gets himself mixed up in an assorted amount of mischief due to him constantly popping up everywhere. Since he has no wish in special to entrust the Holy Grail, this Servant's motivation greatly fluctuates depending on whether or not he likes his Master. The type who is frankly straight with the person he came to like, regardless of said person being of the opposite or the same sex.