For all that Wrath's entire existence had been a whirlwind of fear and uncertainty from start to finish... he never forgot that Winry was the one who'd bathed him, dressed him, watched over him while he slept... Even if she hadn't been able to stop her best friends from terrorizing him as much as humanly possible, she at least tried, and that stood out!

As for the glimmer of mischief... it's almost as surprising to Wrath as it is a relief to Envy, because it's been buried deep, and hasn't peeked out in a long time. Almost self-consciously, Wrath stirs his soup around, mumbling, "They were the only ones that fit. S'not clever..."

But... being a Homunculus, his sense of irony was already keenly sharpened-- and it had only grown moreso, once the wool had been pulled off his eyes.

So there is another, tiny little glint of the Goblin Inside when he adds:

"... but it is funny."