I'm sure I'm not the only one that finds 99% of job abilities boring to look at - I just want to propose some dynamic job abilities for the 90-99 range (perhaps with some new effects) that are not only visually pleasing - but help balance some of the jobs that need a boost. I will give a few examples below (explaining as well as I can how they would look - please note these are not necessarily the jobs that need boosts, but merely ones that came to mind). Perhaps strong enough to be dubbed "One Hour Abilities" with additional effects.
Ninja: Ninja disappears in a cloud of smoke and reappears from the top right side of the screen slashing target monster as it lands on the left side. Disappears in a cloud of smoke and reappears on the left upper side of screen slashing target monsters and landing on right side. Disappears in a cloud of smoke and reappears above target monster delivering a powerful backstab. Attacks are somewhat inaccurate (affected by accuracy) and final powerful blow's chance of landing based on whether or not first 2 attacks landed. Additional after effect: weapons attack occasionally 2-6 times (2 per attack actually landed) with effect dissipating 2 attacks per 10 seconds.
Dragoon: Basilisk Vault - Dragoon jumps on target monster, back-flips and lands outside melee range. They then run a few steps, use the butt of the lance to vault themselves in the air and deliver a powerful stab from ~90% degree angle. Must have a lance equipped. Additional after effect: target's defense (magical + physical) lowered to 0 for the duration of 60-120 seconds (depends on if both hits land)