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What happened to Coco??
The character tells Beckett to go investigate Kendra Pitney's murder, and that's pretty much it. Despite seeming to be her boss, he doesn't appear again.
Holly Gagnier (fun fact: Holly used to be my teacher in LA, and I just found out she was on ER) played med student Tracy Young. She worked with Ross in the pilot, and seemed like she'd be important to future plots, but then never returned.
Marnò played Roxanne Majidi, Elizabeth's stylist and image consultant in the pilot of Madam Secretary, then vanished, despite having an office in the state department building. She also briefly appeared in the Season 6 premiere, but that's all we got from Roxanne.
Leonid Kinskey, who played Vladimir in the pilot, reportedly didn't like appearing alongside Nazi characters/the way Nazis were portrayed in the show, so he quit. This led to Carter becoming a main character.
Fluffy caused problems at the wedding when (s)he was chased by Tiger in the first episode, but was never seen again. Interestingly, Tiger also disappeared a few seasons later.