From Mighty Morphin' Power Rangers: Tommy and Jason, who even had several "breakup" episodes; Rocky and Adam, who were best friends; Kim and Aisha, who were also best friends, briefly lived together, and there's a cute scene where Kim kisses Aisha on the cheek to cheer her up after a local sorority-ish thing rejects her.
Plus Jason and Zack before and after Tommy shows up.
From the same season, PsychoYellow's One-Winged Angel form is a wasp. Pink's is a giant flower. Sure, you could say it just signifies how Pink, even as her teammate, was just a pawn for Yellow's plans, but it's not hard to get the vibe that they were literalPsychoLesbians.
A case could probably be made for Ashley and Astronema/Karone. In the final scene of the season, Ashley is the first to touch Karone.
Leo also gets two fandom boyfriends: Mike and Kai.
Maya/Kendrix is also extremely popular.
Carter and Ryan, being the Red and Sixth Rangers. Particularly due to Carter staring at Ryan's naked back during the cobra tattoo arc, but lack of screentime between the two poses some drawbacks.
Same can be said for Joel and Chad in "The Mighty Mega-Battles".
On the Les Yay side, Kelsey/Nancy (from "Riding the Edge") has long been read this way by fans.
Kelsey also does this with Dana.
Wes and Eric acted like they had broken up a while back and were still bitter about it.
At first glance, Eric could easily be interpreted as an angry ex of Wes' and it wouldn't require a word of dialogue to be replaced.
Conner is also paired with his Blue, Ethan. Seeing as his popular het pairing is with his Yellow, it's safe to say Conner has chemistry with all of his team (except Tommy, who belongs to Kim, Kat, and/or Jason too much to engage in inappropriate teacher/student relations).
Tommy and Mesogog have a couple of scenes that positively gush Subtext. In his Dr. Mercer identity, he told his son that he and Tommy had had their time and moved on, as if they'd been in a romantic relationship, and when Tommy's held captive and strapped to a table in Mesogog's lab (!) in one episode, Mezzie leans to within an inch of him several times while threatening him. Any closer and he'd be nuzzling Tommy's neck. When Mesogog orders his Mooks to attack once the Rangers show up, Tommy sighs, "I hate when he gets like this."
Sky/Bridge, which seems to comprise all of the slash that isn't Wes/Eric or Tommy/Jason.
Cloud Cuckoo Lander Green Ranger Bridge, who falls asleep during an important meeting, is prodded by the Police Chief and responds with a half-asleep "Five more minutes, Sky." (referring to the Blue Ranger). Just one of several Ho Yay moments involving these two.
Not without evidence. Casey's greatest fear (revealed during an early two-parter) was something coming out of his closet. He offers to give RJ rub-downs (mistakenly believing that RJ has regressed to his wolf form), and he also mentions being the "catcher" for his little league baseball team. Given RJ's bohemian attitude to life, you could very easily see RJ and Casey getting together. What didn't hurt was that every other character paired up. By the close of the finale, Dom and Fran had run off to Europe together, Theo was dating Lily, and Camille and Jarrod were closer than they'd ever been.
As does Casey/Theo and RJ/Dom.
Taken to ridiculous extremes during Power Rangers RPM, when the fans would routinely pair every character with just about everybody else. Dillon/Ziggy was the most popular, so popular that even one of the actors commented on it. Dan Ewing, who played Dillon the Black Ranger, was being interviewed once and mentioned how supportive the fans had been to the RPM cast. Then it got weird.
"Even the creepy fan-love things. People, creepy. Like, okay, if anybody listening to this is doing any creepy love stuff between me and any of the other Ranger males ... stop that shit."
What was so brilliant about that is Ewing was less annoyed that slash fanfic existed, and more annoyed that everybody was pairing him with the wrong guy. When told of the love for Dillon and Ziggy (Diggy, as it was called), Ewing exclaimed, "How would that be a good match?", and then wondered why people hadn't paired him with Eka Darville, who played Scott the Red Ranger. Brilliant.
Power Rangers Samurai: Antonio. Just... Antonio. Jayden's childhood friend returns to become the Sixth Ranger in "Unexpected Arrival", where after a rather, um, flamboyant showing in battle, he announces "I'm ready for some action" and struts toward Jayden (to give him a hearty handshake), set to a musical cue that could easily pass for romantic. In the following episode, "Room for One More", he arrives at Shiba House in a tuxedo, and petitions the Rangers' mentor to join the team in a scene that feels very much like he's asking Mentor Ji's permission to date Jayden. That Jayden coyly waits outside rather than sitting in on the interview with the other rangers adds to the feel. Given the fairly weak acting of the season to this point, it's a bit striking how much more genuine their affection seems than any other emotion any character has conveyed all season.
The end of "Broken Dreams" adds a whole new level of Ho Yay when Jayden and Antonio are limping to the bench, panting and catching their breath while saying things like "Every muscle hurts" and "Just like old times."
Super Samurai just makes it more blatant. Antonio literally tells Jayden to hit his Zord in the butt. Granted, it's to get it to work, but still.
Power Rangers Megaforce starts off with very strong Emma/Gia. Gia catches Emma's book when it falls and has her drink order memorized, and the way that the two look at each other screams "girlfriends."
Especially in the 'girl power' episode. Before the casting of and after the breaking of the spell that makes them bicker and argue, they're oh so touchy-feely with each other, and in fact, during it, they seem more Like an Old Married Couple than anything like the murderous rage the Monster of the Week had intended to infect them with.
In fact, the actors for Emma and Gia are aware of it and jokingly tweeted their pairing name◊ after that episode aired. Then there's this◊.