Synergistic support pairings?

So we all know about common meme pairings like Hector/Zephiel, Eirika/Valter, Lucina/BLucina, Ike/BIke (all of which pair pretty nicely tbh), or even ones that don't, like Lucina/Masked Marth, Ike/Black Knight which I'm sure is coming soon, etc. But what about pairings specifically to augment characters' in-game performance? I have plenty of good units, but at a loss as to which way is best to pair many of them up. Starting off with a few I've done already:

Ephraim/Nino: This one is obvious. Eph gives her +13 with Sieg+Hone Spd+Rally Def/Res or Rally Def+Fortify Res 1 seal, THEN gives her the support bonus further enhancing her nuking potential. He also enjoys her bonus to further solidify his ability to clear/soften reds for her.

Elincia/Cherche or Minerva: mutual Goad Fliers is what I'm running on them, and whichever green partner you give Elincia serves to clear or significantly weaken blues, as with them gone she can clear entire maps with either a brute force deathblow build or +spd quad.

Lukas/Celica: A pairing I just created, my Lukas has a Blue BIke/Steady Breath build, and he nukes basically every non-green melee unit that attacks him on the enemy phase. That's where Celica comes in, as she's a player phase nuke that wipes every single green off the face of the earth. He also really appreciates all 4 buffs an S support gives, and since my Celica is +atk she loves the +2 spd in particular, and both run movement assists to help each other out. Didn't play Valentia so I don't know if this is thematically appropriate or not.

Sophia/Fae: An anti-meta pairing, my Raventome Bowbreaker Sophia sharts on Lyn, Bridelia, and any other bow users, plus most greens including green mages, Hector and BIke. My Fae isn't fully geared (just need to finish grinding feathers to give her Lightning Breath+), but she's a hard Reinhardt counter who can also function as solidly anti-blue, both freeing the rest of the team slots to not have to worry about the top 2 meta defining threats, and leaving only reds to be accounted for (easy enough). Sophia uses 3 out of the 4 stats buffed by ally support, and Fae utilizes all 4. It's also another thematically appropriate pairing, but that's mostly by accident :)

Ike/Soren: I've spoken about this before, but Raventome Soren takes out the main 2 threats to Ike (shakier on Brave Bow users, even with Bowbreaker), while Ike is strong enough to defeat or at least draw with virtually every non-blue. Also, obviously conceived of largely for the OTP husbando factor, otherwise Boey runs TA Gronnraven better.

What pairings have you guys found that synergize well? Some other units I'm wondering about in particular are Sonya, Julia, Delthea, BIke, BLucina, BRoy, Tharja besides Ephraim, etc.