Speedwagon takes care of Erina and Joseph Joestar much like a father figure or close uncle. Equipped with a courteous nature, he is familiar with giving one's privacy; this is apparent when upon trying to enter Jonathan's room, he witnesses the nurse, Jonathan's former love Erina, nurse him back to health and leave Jonathan to Erina's care. This righteousness would be a characteristic of him throughout his life, as an elderly Speedwagon specifies in his will that his foundation should be used to fund medical and archaeological advancements, and his organization aids the Joestar family time and time again long after his death. Apart from that, Speedwagon is known to be anxious and hotheaded. He is very extroverted and loudly conveys his feelings, from enthusiastically describing Jonathan fighting, to his despair at seeing Kars become the Ultimate Thing. Above all, Speedwagon deeply cares for his friends, and he constantly seeks to help his companions in various more or less convoluted ways. He notably breaks into a hospital to emotionally support Jonathan,[10] harasses Zeppeli so that he would teach him the Ripple, and has thought of using the warmth of his stomach to unfreeze Zeppeli's arm. Speedwagon also has often tried to confront zombies, to varying degrees of success.
