I know who the Elric brothers are...
LEEK
BELL - 1
HELL - 1
BILL - 0
BILE - 0
TEST - 1
MESS - 1
SEAM - 1
DESK - 2
DEAL - 1
PERK - 2
NECK - 2
BEAK - 2
GEEK - 3
JEEP - 2
WEEK - 3
LEEK - 4
+5 Quag +5 Cat +15 Kitten
As to the hint Hatsune apparently waves them around. In the video's I posted the audience is waving leek shaped glow sticks.