Dating pre 64 winchesters
Compare Crystal Dragon Jesus, Everyone Is Jesus in Purgatory, and Mundane Made Awesome.Contrast Rule of Symbolism, when something symbolic.
Over the years, a Hero and their nemesis will share trials, failures, and successes at each other's hands, each becoming enormously important in the other's life and more intimate (not kinda intimate! It can sometimes grow to the point that the villain will refrain from killing the hero in a "cheap" or dishonorable way, and even start to concoct bizarre excuses to avoid doing so entirely, spare his life, or .There are times when works rely a lot on symbolism, taking note of things that have occurred in history, religious texts or other such things.Symbols can add a considerable amount of depth to a story, leaving the audience coming back for more to further analyze a work that they love.If another villain kills the hero, this one may make sure that the hero doesn't die alone, and the hero will do the same for them. Has nothing at all to do with attacking your teammates, nor with Helpful Mooks.Even if the villain doesn't switch sides, it's not impossible for both to be friends "off the clock", or take time out of their latest fracas to Go Karting, or share a meal, or run errands together. A villain may notice that this is weakening him against the hero, and he'll promptly jump off the slope that they've been slowly climbing and undoing seasons worth of Villain Decay by doing something truly vile, like stuffing the hero's girlfriend in a fridge, or just plain pulling out new and lethal tactics when the hero is expecting the same old Harmless Villain. See Dating Catwoman for the (explicitly) romantic version. There is also the Friendly Rivalry which is essentially a milder version of this trope where the antagonistic characters are just competing (in some kind of sporting event, for example) rather than trying to thwart each other.
It is also not to be confused with a symbolic Easter Egg hunt where the writer, director and production design team purposefully insert numerous small but meaningful elements, the understanding of which are not necessary to appreciate the plot, theme or character development but create fan discussion and add to rewatch value.