IKU
fever time
For every level Iku gains, gain +1 damage, +1% ASPD, and +10 HP
MOKOU
honest man's death
Whenever Mokou attacks an enemy girl, her BAT is reduced by 0.15 seconds
KOAKUMA
devil librarian
For every 2% of Mana that Koakuma is missing, she gains an extra 0.1/sec Mana regeneration. This can also be amplified by items.