List of unnamed individuals of unspecified eras.
Fendaus V leaders
Flint claimed to have been married for love a hundred times, as of 2269. In his own words, he had "selected, loved, cherished. Caressed a smoothness, inhaled a brief fragrance." Having to lose them all to death prompted him to attempt to make himself an immortal mate, ultimately culminating in the creation of Rayna Kapec. (TOS: "Requiem for Methuselah")
Other than Catullus, Tarbolde, John Keats, and Tavor Kell, these hundreds of artists were all recipients of Onaya's inspiration. Unfortunately, they all died younger than they would have. Onaya believed that the immortality her influence afforded them was worth it. (DS9: "The Muse")
Scalosians' non-Scalosian mates
According to Deela, the Scalosians had to take mates outside their own people after their men became sterile. Accelerating them with Scalosian water caused these mates to burn out. (TOS: "Wink of an Eye")
According to Crewman Daniels, himself a temporal agent, dozens of temporal agents were stationed throughout the timeline with orders to alter history after the outbreak of the Temporal War. He informed T'Pol of this in Enterprise NX-01's sickbay when he had sent the ship back in time to 1944 to avert the war. (ENT: "Storm Front")
Prior to 2367, the crew under the command of Bela Tyken did not suffer from behavioral changes or sleep disturbances while trapped in what would later be referred to as a Tyken's Rift. (TNG: "Night Terrors")