User blog comment:Linathan/Unit Spotlight: Light Legend Atro/@comment-26336535-20150507002209

Atro's UBB is crazy, and I speak from personal experience as it caused me to destroy many raids. I have Atro as a Breaker, and with Urias and the extra skill, his ATK is almost as high as my Anima Eze with Batootha and extra skill. With that, Atro's UBB deals ridiculous damage to the boss, and then the 50BC per turn lets me keep spamming SBBs. The only downside was that I was using Tridon, who I believe requires 70BC to fill up SBB, and he would just be 2 or 3 BC away from his SBB after every turn.

Of course, If you're leading someone with Are's Excelsior and the like, the 50BC per turn is kind of excessive (though it synergizes well with Supreme Ruler's Magic, which shrinks the gauge itself instead of affecting the effectiveness of drops.