Aranea & Edgar are the only units in GL to increase BRV DMG uncapped. Check Safeena's amazing calc in her sheet !

Note that Leo's debuff stacks additively with weakness type damage, and is maxed out and capped at 150% (2.5x) DMG up.

We expect that Selphie may pair favorably with Leo as his EX recharge is lowered to just 1 skill and an HP+, or just 1 skill if you remove his speed passives (careful as you may need his speed to shave alongside Selphie!)