User blog comment:Crimson Storm Mich/Future Units Preview/@comment-26698997-20160419144938/@comment-27518538-20160421104215

I think the numbers on this page are incorrect, they are using Sirius's 7* numbers, it should be 300% BB Atk and 140% all stats, but anyways with SP options Sirius has the strongest BB Atk mod at 400% and the best BC on spark effect, plus he has the second strongest all stats buff, ontop of Dark, Light elements.

His UBB is also amazing, it's Haile's UBB, which is already good, and slaps on 3 turns of 75% Mitigation, perfect to use in almost all hard content because it covers Mitigation, BB support and Offensive Buffs all in one.

Put OE Sirius in a squad with Rouche and you have all 6 elements and almost all offensive buffs excluding spark and a conversion.