Grima... was significantly more powerful than I thought he'd be.
Panne: Dealt 2 damage, hit for 36 by Grima's Expiration, then killed by a nearby incredibly weak Grimleal.
Morgan: Dealt 11 damage to Grima, hit critically for 98 damage (she had 55, and was a Taguel).
Gregor: Dealt 0 damage to Grima, was oneshot in return.
Chrom: Dealt 12 damage to Grima, brought to about 4 hp by Grima's Expiration, but managed to survive the next few turns.
Yarne: Dealt 0 damage to Grima, was oneshot in return.
Nowi: Dealt 1 damage to Grima, was oneshot in return.
Nah: Dealt 1 damage to Grima, was oneshot in return.
Frederick: Dealt 12x2=24 damage to Grima, but was killed by a mage a turn later after they crit with Waste twice.
Flavia: Dealt 11 damage to Grima, brought to 3 hp by a gang of Grimleal but healed because holy shit Sol OP. One of the only survivors.
Lon'qu: Dealt huge damage to a bunch of Grimleal, was killed by a lucky crit from a mage using Ruin.
Streetpass Characters:
King Marth - dealt 8 damage to Grima x 2 = 16, was hit for 48 of his 77 hp, then healed that damage off using Aether and Sol in two moves. Narrowly avoided death.
Minerva - Dealt 11 x 2 = 22 damage to Grima, was hit for 34 of her 68 hp.
Larcei - dealt 3 x 4 = 12 damage to Grima, was hit for 42 of her 49 hp.
and lastly, my Avatar, who spammed Book of Naga the entire battle.
Reudh: Dealt 15 x 2 = 30 damage to Grima, was hit for 32 of his 74 hp, then ganged up on by enemy mages. As the Avatar is required to defeat Grima, i got a game over.
Worst part is?
Grima only has 80 hp. he had mages far, far out of my reach spamming Physic (heal a distant ally), healing him for between 16-24 hp a turn. Thankfully, i could just barely damage race them, but even then as Reudh fell I failed.
Total damage to Grima:
30 + 12 + 22 + 16 + 11 + 24 + 1 + 1 + 12 + 11 + 2 =
142 hp.