In terms of every day appearances, you're likely to find them wandering around in their Heroic Spirit Tour outfits. Because they're cute.
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Even if you run into one of them alone, the other is absolutely liable to just Suddenly Appear next to them. Typically if you find one of them separate from the other, it's probably safer to assume the other is with them in Spirit Form than that they're actually alone. Please feel free to reply to either of our permissions posts if you want to give blanket permission or opt-out across the board for thread-hopping.
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If you text Pollux, you're liable to get a reply from either one of them at random. I don't remember what I did with Castor's phone. Castor probably remembers what he did with his phone but doesn't particularly care. It's like when you text your friend and get a text back like "This is her boyfriend" or something because there's been a misunderstanding, except there probably hasn't been a misunderstanding.
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The two of them eat through an insane amount of food. You would not believe how much food they eat through.
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One of the places they likely pass their time together is the Sports Deck. They might ask how certain modern games are supposed to be played a couple times, and Pollux is happy to invite others who look interested to play with them.
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Photos at Sea will feature pictures of Castor and Pollux throwing girls over Castor's shoulder like sacks of potatoes, Castor folding little doily flowers with Fio while looking very serious about his arts and crafts, and Pollux mid-fall kicking Jason in the nuts.
Castor
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Castor is liable to be found spacing out wherever he happens to be on the boat, especially if Pollux is nearby and doing something he's not particularly interested in himself. If it's just him though, he can regularly be found doing this on the deck, looking out into the ocean.
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Out of the restaurants and amenities provided, Castor is partial to Sand Dollars. Whether it's because it's one of the few places not focused on serving alcohol, or because (if nobody else is doing so) he is collecting a couple doilies is anyone's guess. If you do catch him sniffing around the Hurikane, which he also does, you can notice that he waters down his wine. A lot.
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He's actually very much less of a bitch when Pollux doesn't seem to be around. Actually, he's pretty normal then.
Pollux
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Pollux can often be found hanging out in the library! She's a big fan of human stories and the knowledge they've collected, and will happily chatter away with other passengers about the books. Feel free to give her recommendations!
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Pollux likes to hold people's hands, and warm them with energy even though she's not supposed to.
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She also hangs out around the gym. Sometimes she's practicing for fun, sometimes she's observing others and may make comments about the style or form they use (curious or giving advice), and sometimes she seems to be eagerly waiting for a certain someone to show up.
DIOSCURI - Room 143