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Step 1 to making a completely neutral, platonic character. Make them stare jealously for almost two whole minutes when their opposite sex traveling companion is being flirted with.
Step 2. Have them get especially heated about the subject of them dating, and don't extend this to the other traveling companion. when it happens to them just have them shrug
Step 3: At the end of the movie, have the neutral character resolve to take charge of the main character. Even if it means diving into arctic waters. Make sure they have this moment with the person who has been insisting the two are in love the whole movie