Cheerful and gregarious, Rider acts oftentimes more like an excitable tourist than a king. He shows great joy for traveling to foreign lands and sampling their various wonders, so being summoned in modern times through the Grail is a dream come true for him even without the chance to match his skills against other legendary heroes. A lover of speed and the road he's particularly fond of modern vehicles like motorbikes as well as motels due to having founded the first recorded instance of them to shelter wanderers.
He also takes pride in his footracing speed and will often challenge his opponents to one. One of his favorite things to do to amuse himself as king was by having advisors race with him while he carried out meetings. Rider still chuckles at the memory of those usually out of shape politicians left panting and gasping by the end while he was still perfectly fine.
"You shoulda' seen those guys Master, and I wasn't even using half my full speed either!"
Apart from his nomadic nature Rider's other most notable trait is his extreme ego. While Rider won't look down on others as blatantly as a certain golden king he claims brotherhood with, he's very insistent to be recognized as the best at anything he sets out to do. This leads to a somewhat off-putting degree of arrogance as he's constantly showboating and trying to flaunt his skills around others, which might lead more cynical individuals to falsely assume he actually doesn't have the abilities he claims to.
This gloryhound behavior and egotism in truth masks a deep vulnerability as Rider is desperate to know that his legacy was immortalized in history. The thought of being truly forgotten terrifies him and is the one of the few things that can break his usually sunny demeanor. If he were summoned in past eras where knowledge of Sumerian legend had largely been forgotten, it's likely Rider would show a far darker and more bitter aspect to his personality. While he performed great deeds and became a king his people admired, it was all for the sake of his own fame making him a rather selfish person- though not incapable of caring for others.
He can empathize with others who share his wanderer's spirit and believes that when someone has a dream, they should chase it as far as they can no matter where it leads them.
"You might even be half as amazing as me someday!" Conversely, he can't forgive anyone that'd persecute those who just wish to innocently travel.
Rider is also a flirty guy who'll try to pull moves on any girl who catches his eye. His "type" is strong and passionate women who can kick the crap out of him like his beloved Inanna/Ishtar. Incidentally, once he finds Ishtar has been summoned in a vessel amongst Chaldea, he'll waste no time finding her and teasing her over her new body.
Rider's wish on the Holy Grail is simply to ensure his fame truly lives on for all time. Aside from that, he'd like to be reborn in the modern age and try opening up a motel chain.
Likes: touring foreign lands, running, fame, strong women, sweet fruits on the side of the road
Dislikes: being forgotten, settling down, people who "harsh his buzz", persecution of travelers
Talents: everything necessary for a king, running, praising himself
Natural Enemy:
Ishtar