Sanders Sides where everything is generally the same, but Logan calls Roman his “other half”, because he genuinely doesn’t know the romantic connotations of that phrase. He only says that, because each of them represents – in general – one of two hemispheres, so together they make up an entire brain.
Virgil and Patton have a quiet agreement to not explain it to Logan to not embarrass him, whereas the dark sides genuinely think he and Roman are dating. But Logan didn’t even know they believe in that, because Janus’ comments are always very vague on purpose and Remus usually shouts weird stuff regardless of the topic.
Roman’s just confused.
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(Alternatively... Logan knows what this phrase actually means and pretends to be clueless, so can get away with using a pet name for Roman without telling him anything explicitly.)
