Board Thread:Questions and Answers/@comment-26572894-20150722222527/@comment-26021614-20150723041410

For arena, currently I would say the best unit is Quaid for arena. Here's my reasoning:

BB with AoE damage is superior to everything in arena. BB with AoE + bb gauge boost is the best arena bb you can have, but you only need one.

In order to get BB within the first turn, you need a leader skill that boosts BB and/or BC rates. That leaves you with many many options. Feeva will probably be the best at doing so out of those 4, but you don't need that much of a boost as your BB gauge is already half filled at the beginning.

Aside from BB, the second most important thing is making sure your opponents cannot use BB on their first turn. They will only be able to use BB on their first turn if they have "increases bb when attacked" effects, either with spheres or leader skills.

Next most important thing is keeping your units alive after their attacks. This is done by increasing defense and HP with spheres (because leader skills usually don't increase BB and HP/DEF at the same time), but this is also done by eliminating your opponents' units on the first turn by increasing your units' ATK.

Quaid can remedy all three of these factors with his leader skill. 100% increase in attack will allow you to eliminate your opponents' units before they have a chance to attack, BB or not, and it will not allow your opponents' units to gain bb when attacked because if it is attacked, it will be defeated before it can fully fill their bb gauge.

Quaid is also AI type 3, which means that it can be versatile in where it is placed in your squad.