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- family enemy is a fierce (openly an enemy) rival because of distant ancestors being rivals
- former friend is a friendly rival because of distant ancestors being rivals
- family enemy is a jealous (may seem friendly) rival because of special
- professional rival is a intense (secretly an enemy) rival because of jealousy of character's possessions/position
- really unusual people (people of unkown race or origin, etc.) is a friendly rival because of a perceived an insult