Changes to spells when under Tank Mimicry:
Dragon Force, Cold Fog: Cast times removed, made instant, they have a long cooldowns to make up for it.
The Look, Diamond Back, Chelonian Gate, Revenge Blast: Cast times reduced to .95s
Cactguard: Can be used on yourself when in Tank Mimicry.

Changes when under Healer Mimicry:
Gobskin, Exuviation: Cast times reduced to .95s

Changes when under DPS Mimicry:
Moon Flute: Cast time reduced to 0.95s.
1000 Needles: Deals 1000 damage to each enemy instead of being shared.
Condensed Libra: In addition to it's Attenuation, it also deals 200 potency damage of the same type as the Attenuation.

Level 80 Spells:
As we're quickly gaining more spells than we'll ever use, they need to branch out a little into different types of actions, and I think we need Limit Break Spells. High potency spells that consume the limit gauge.
They could consume individual segments of the limit gauge, so that multiple BLUs can use their limit spells.