Thread:SomeoneYouUsedToKnow/@comment-27144409-20180804200459/@comment-25936766-20180805140325

I assume you mean "Rider class". Which, let me tell you, has nothing to do with mobility. A Rider is characterized by, well, having rode something, be it a "living beast" like a horse or a "human construct" like a ship. People who innovated transportation, especially for warfare, can also count.

It can also be much more vague. A general or national leader could count for Rider class under the idea that they "rode an army" (or men, in Queen Medb's case. And yes, put your mind in the gutter for that).

Now, just because a Servant is a Rider that doesn't mean they come riding something. However, their mount or vehicle is normally among their Noble Phantasms and some Servants have more than 1, and some Noble Phantasms do include summoning a "crew", not necesarily mounted themselves.

Francis Drake, for example, doesn't come with a ship, but her Golden Wild Hunt: The Night of the Golden Hind and the Storm NP involves summoning her ship, the Golden Hind, along with an entire fleet.

Alexander the Great's NP, Ionioi Hetairoi: Army of the King, creates a Reality Marble that turns the terrain into an empty obstacle-less desert while summoning his entire army as minor Heroic Spirits, but said army is, well, an proper army, it's not 100% cavalry, in fact it's mostly infantry.