The U.S.S. Tikhov was a seed-vault starship used by the Federation to store samples of every known plant in the galaxy. Over the previous 500 years, each planet of the Federation took turns keeping watch over it, and by 3189 it was the Barzans’ turn.
Dr. Attis was the Barzan patriarch of the family guarding the Federation’s seed-vault ship, the U.S.S. Tikhov, in 3189. His daughters’ names were Amma and Tolpra, named for the two most beautiful moons in the Barzan star system. When the Tikhov was struck by a coronal mass ejection (C.M.E.), he was in the process of transporting into the vault, which saved his life but caused him to continually phase out until Burnham, Culber, and Nhan rescued him. Unfortunately, the rest of his family was killed during the C.M.E.
Cleveland "Book" Booker V was a Kwejian male, as well as the first person Burnham met in 3188, after she crashed into his ship and damaged it, causing him to crash on Hima. At first, he stole from her, desperate to buy more dilithium so he could get the tranceworm he’d stolen/rescued to Sanctuary Three for protection, but eventually he was coerced into helping her in her attempts to reconnect with Discovery. Over the year they then spent together working as couriers until she was reunited with her crew, the two fell in love.
Having taken the name Cleveland Booker in honor of his mentor - who was the fourth to inherit the name - he was originally from Kwejian, where his name had been Tareckx, after his father. He had a very large cat named Grudge, and a non-biological brother named Kyheem that he hadn’t heard from in fifteen years in 3189, whom he later learned had a son named Leto.
Haz Mazaro liked to call him Glow-Worm, presumably because his forehead would glow when he was connecting empathically to other species.
Ensign Casey was a human male crew member on the bridge of the U.S.S. Cerritosin 2380. He was also a member of a group of ensigns who called themselves The Redshirts and focused on making themselves into leadership material - by honing their posture, their stride, and their inspirational speeches.
Jennifer was a female Andorian officer aboard the U.S.S. Cerritos. She was a member of a group of ensigns who called themselves The Redshirts and focused on making themselves into leadership material - by honing their posture, their stride, and their inspirational speeches. Jennifer saved Mariner after the Cerritos was hit by debris and she flew out the front window where the viewscreen had been removed, and they became friends as a result.
The U.S.S. Solvang NCC-12101 was a California-class Federation starship commanded by Captain Dayton. This was the ship she was given after the destruction of the Rubidoux - but then it was destroyed as well, after it was attacked by a mysterious ship.