I’ve seen it so much, it’s pretty much been established for me that Lewis, Vivi, and Arthur all have nicknames. Vivi uses them the most. Her actual name is Vivienne, but she prefers the nickname Vivi, and she likes to give other people new names too. She likes calling Lewis “Lew” or “Lewlew”, and Arthur “Artie” or “Art” whenever she can. She’s does it in a playful way, and neither of them mind, so the nicknames just kind of stick.
Despite the fact that they both tease her for it, Lewis begins using the ones she came up with for Arthur when addressing him, and Vivi he will call “Viv” or “Vi” at times.
When they all get even closer, he begins to give them Spanish nicknames, ones they don’t understand since he says them so quickly, but allow Lewis to be honest with them about how he feels. He calls Vivi “El amor de mi vida”. However, Arthur is really good with languages, so he picks up what Lewis is saying and pushes Lewis to ask her out. Lewis had called Arthur “mi corazón” once or twice, but when he learned how quick Arthur was with picking up new words, he swiftly changed to referring to him as “amigo”, or by one of his names, so Arthur wouldn’t learn how he felt before Lewis was ready to share.
Arthur picked up Lewis’s nicknames for Vivi, but he would only call Lewis “Lew”. “Lewlew” seemed too intimate for him to use, because as much as he liked them both, he knew Lewis liked Vivi, and she reciprocated the feeling, so he wouldn’t get in the way if he could help it.
When the group is reunited after the cave incident, and after a few months, Lewis begins to notice something. While Vivi doesn’t change much when her memories are returned, Arthur now only refers to the bluenette as “Vivi”, and Lewis by his given name.
He can’t figure out why this is, and when he expresses confusion at this odd change, Vivi pulls him to the side.
“Lewis…Arthur hasn’t used any of those nicknames since you died. He actually started calling me Vivienne for a while, but I was able to get him to stop after almost a whole year.” She bites her lip for a moment and rubs her eyes tiredly. “I don’t know exactly why, but….but I think the nicknames were a symbol of the friendship between the three of us. And Arthur…after the cave, he felt like he didn’t deserve that anymore.”