Red is still dominant, as are Hectors/Effies. But I am seeing more and more Nino-like builds popping up with time, still never ran into a Horse/Flier Emblem, though, surprisingly.
One thing that remains true right now however is that in competitive (Arena), the only colorless units that are worth a lick are Kagero, Takumi, and Klein.
Jaffar and Jorge as well.
Not sure if he's worth a promotion just for it, per se, but yeah, I tend to base most my decisions on the upcoming arena heroes and focus on a core trio of units. He can replace Jaffar temporarily but I think him, or something like him, may be a necessity for sniping units getting out of line. Michalis is more of a mobile physical tank so while he shares a lot with what Eirika is bringing, her buff utility is pretty hard to give up and Y!Tiki is the closest to a mage tank in that setup, though worth noting I expect a lot of Spring Lucina in the coming weeks to lower her value somewhat.
Michalis is basically a flying/named hero version of Frederick. Both have massive physical stats with mediocre speeds and comically low resistances, and thats one reason I don't really *want* to promote Michalis. He'd just be a flying Frederick, and Frederick already can teleport!
That said, yes, you guessed correctly in that my Eirika is a major buff-bot and position control unit. She's VERY hard to give up, while Tiki-loli is indeed a mage-tank and helps round out my team with a non-physical, non-blue damage source. Its quite the pickle as I really do like this team but I do have issues when Ephraim or Shareena show up backed by, say, Nino or FCorrin or Merric or etc...
Tiki-loli is actually probably my weakest "all rounder", even more so than Jaffar, surprisingly. Jaffar will simply demolish a unit and survive with ~3-5 HP across the board due to his health and high defenses (even after L&D3 reductions, his low base attack guarantees seemingly across the board that he has to trade blows). I am looking to get Desperation on him to exploit this fact.