The unit that actually refers to the other characters in THiW as their "Deary Scrunklies" to begin with.
Who is Demeter?
(Ch. 1x post-map cutscene)
The most evil act Jane ever committed.
What is "steal somebody's dessert during lunch"?
(Ch. 19 base conversation with Jane and Conan)
The total quantity of Vulneraries that Vasiliki produces for you, provided you pick her up at the first Roadside Stop.
What is ___?
The fort Ch. 2x revolves around must really suck from a "structural integrity" point of view if this is what happens to it.
What is "the entire interior wall vanishing if the doors are opened"?
"A pittance of 750 gold would keep my / granddaughter afloat for a few weeks"
Who is Laertes?
Camp conversation; Ch. 15
Teresa's original occupation before Alonso and her went off on their own adventures.
What is "[his] maid, dammit!"?
(Ch. 15 base conversation between Teresa and Alonso)
The "only thing [Glaucus] aced", by Glaucus' own admission.
What were his foreign language courses?
(Ch. 21; Camp conversation between Glaucus and Jingyi)
Should Wulfric ever die, this unit stops being able to do a specific thing.
Who is Tiresias and what is "raise his weapon rank for Staves"?
If you really wanted to during Ch. 5x, you could let a unit do this for... no benefit at all.
What is "use the stairs to backtrack after a section of the map vanished to trap a unit in the void"?
"I'm so... happy... / to see you..."
Who is Kyra?
(Her death quote; Ch. 23 onwards)
Pluto, in his attempts to fake being an edgelord so hard, copied his stats and growths (other than Magic) bar for bar off of this unit from mainline FE.
Who is Rutger (Binding Blade)?
Apate's original hair color, from hundreds of years ago.
What is "olive"?
(Ch. 20 post-map cutscene)
"...... / Fair enough"
Who is Órlaith?
(her recruitment conversation; Ch. 8)
Perhaps it's better López doesn't shower, because his Stinky skill secretly does this per Rubenio himself.
What is anything along the lines of "serve as a reskinned Rightful God to boost his Despoil proc chance"?
These two playable units' shared history are indirectly hinted at by how they both jump to "favorite color" as the first "fun fact" they tell others when said others want to know them better.
Who are Beatrix and Scymerius?
(Beatrix = Camp conversation; Ch. 22 with Fiadh)
(Scymerius = talk dialogue during Roadside Stop)
Perhaps to avoid accidentally totally spoiling the surprise, the class showcase if you idle on the title screen incorrectly says this class uses Anima magic.
What is Demeter's Malig Knight?
"Boys, it's time to teach that bum / the price of cheating us"
Who is that unnamed Assassin from Ch. 23?
(The "easter egg" you get if you ignore Glaucus' warnings and bring him close to the Arena on that map)
All of the units hither-then unassociated with the Inquisition that flake with you, should "Kyra" accept Sandraudiga's offer during the NG+ exclusive map "Perfect World".
Who are Nikolaos, Zaccheus/Simeon, and Laertes?
"...What? This is all going to be history / one day! I happen to like history!"
(House dialogue)