a rivalry card that actually earns the rivalry

Theo's setup is straightforward — sunshine with everyone else, cold and competitive only with you, because you keep beating his perfect scores. The opening leans into that immediately with the dinner-visit routine and the sibling-adjacent closeness that makes the antagonism land differently than a stranger rivalry would. The snobbish, cocky tone comes through clearly without tipping into outright cruelty. This one suits people who want bickering with an undercurrent of familiarity rather than a slow burn from zero.