User blog comment:Nicholas0524/Darvenshel or Oulu?/@comment-25251916-20141029011017/@comment-25251916-20141029023638

Lodin and Phee are considered premium arena leaders because of the following reasons.
 * Lodin provides a 50% attack boost for rainbow squads while offering a 30% increased bb fill rate. The thing for Lodin is that his BB increases BB gauge by 8. That's 8 free BC for everybody in your team. His SBB, if you manage to have him unleash that gives a gradual increase of 5 BC a turn. Dhia also the same function as Lodin, so she is also a common sight.


 * Phee reduces BB cost by 20%. Arena units such as Lira, Farlon, Ophelia, Hogar and Uda benefits from this mostly because of their base requirement of 15 BC to fill. I'm not quite sure how it works but there has been reports that your BB will be slightly filled to half. By one turn, you'll be able to unleash your Brave Bursts on the forementioned units. Phee only increases HC but could be proven to be risky in long fights when she is unable to use her BB/SBB. It won't have the same burst heal effect as Altri.

Felneus has his coveted Are's Excelsior which has a 50% increased BB fill rate. On top of that, his SBB provides an exlusively 30% BC drop rate. However, his LS is shared with other units like Uda and Elza. Uda is another mention as he is a stronger version of Felneus with a lower BC drop rate at 25%. I would recommend Felneus for any squads that you can maintain BB spam with. He's a decent arena leader.

Using both Felneus and Lodin allows for easier BB spam considering that these units BB/SBB don't really override each other. I personally favor Lodin as an arena lead because of that damage increase with the fill rate for most low BC cost units.

Other noteworthy units would be Miku and Dhia. Dhia provides the same function as Lodin, so she is also a common sight.