There are some wonderful duos on TV and their chemistry stands out really well for the audience. But sometimes they are connected by another person, and adding them into the mix would create a possible iconic trio in the process.
This is the best case scenario for love triangles where all the people involved are somehow connected to each other, and it removes this idea that there needs to be a choice. Someone is always stuck in the middle when honestly they don't have to be.
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Here is a slideshow of a few examples of exactly that, specifically both platonic and romantic relationships that would only benefit more with the addition of another epic person.
Nancy + Steve + Jonathan - Stranger Things
Nancy, Steve, and Jonathan utilized Stranger Things Season 1 to make a real argument for why love triangles don't have to exist, not when the people in them all care for each other. Steve's character development may have helped his relationship with Nancy, but it didn't stop there, with Steve also making an effort to replace what he ruined in Jonathan's life. So the next step is obviously them realizing that they work best all together, rather than trying to divide into one couple and a third wheel.
Bellamy + Zeke + Raven - The 100
Consider this wishful thinking because, with the way The 100 Season 5 should have ended, it just opened that door for some high-quality Zeke and Bellamy interactions. Zeke is becoming a part of Raven's life, starting with the people closest to her. So why not throw out the idea of Bellamy/Zeke/Raven out into the open? If we are waiting until the last possible moment to explore Bellamy and Clarke then why not allow Bellamy's romantic life to actually be given the attention it deserves?
Ryn + Ben + Maddie - Siren
This explanation just writes itself, especially with how obvious Siren is being about Ryn wanting the comfort that comes from both Ben and Maddie. Ben and Maddie may have their own thing going on, but with Ryn's appearance, it is obvious that the mermaid isn't a way to divide them, instead she is an addition to their relationship.
Monty + Harper + Bellamy - The 100
This still hurts, like a lot. When there was still talk of plot twist time jump couples in space before Season 5, Bellamy and Harper were the underrated option that would have been interesting to explore. But why leave Monty out? Imagine Bellamy joining Monty and Harper, and the trio being pure and kind and worried about their family together.
Angel + Buffy + Spike - Buffy The Vampire Slayer
Chemistry is vital for any relationship, so if you have so much of it between three people in a love triangle the only logical next step is an attempt at an epic trio. There was so much talk over who Buffy should choose, Angel or Spike, when the obvious answer was there all along.
Betty + Veronica + Archie - Riverdale
The aesthetic appeal is too good to deny here and you know it!