Congrats! I don't know much about those characters but are they good?
Also I'm looking forward to the new story chapter! I prob won't pull for Freya but it's really nice when a story chapter comes out. I just love character interaction in this game so much even though it is always the same bland areas. Like Lulu's event they said Yuna was on the airship but then she just appears in the forest. Huh? That was just a bit bizarre. I really want to see the inside of the airship and everyone in it lol.
Basically, Lann and Reynn act as full, 100% HP damage AoE. While they do NOT do more damage to single targets, every enemy they hit will take FULL Hp damage from both abilities, AND the EX!
All of their abilities are also dual elemental, which means that if an enemy resists only one element, they thankfully won't take reduced damage. Even before the big weakness shakeup happening eventually, this makes it much easier to take advantage of enemy weaknesses with them!
Their biggest weakness, outside of being much less powerful fighting single targets, is that they NEED both of their useful self buffs to use their powerful attacks. These are Mirage S, a speed and Brv damage taken down buff, and Mirage L, and Atk, Max Brv AND Def buff.
They are the first characters to start the battle with their self-buffs, but until they get their EX+, they have no way to refresh them without using abilities, which will cost them their longevity, even with an EX that extends both of them a turn, while buffing damage with a FIVE element self enchant, since their First ability uses Thunder and Earth, their Second uses Water and Ice, and their EX uses Fire.
Even so, they still have some of, if not the absolute BEST consistent AoE DPS, even right now in Jpn! Full Hp damage on all enemies also makes them Excellent at clearing waves, and dealing with Boss Adds, like the Wolf Pack. This, combined with no overflow on abilities, means they both benefit greatly from and partially rely on Max Brv buffs, and Excel the most consistently in any bossfights with two enemies in the fight!
To any that get lucky with them, I hope the Boneheaded Brother and the Smart-Alec Sister can be useful to you! Bear in mind that they end up being really useful element support when they get EX+, as it slaps opponents with a DEBUFF to ALL FIVE of their elements, making anyone who uses Thunder, Earth, Fire, water or Ice VERY happy!
P.S. the second ability also inflicts Spd Down, 20%. Also, no Inner Airship stuff is a cop-out, I hope they're just saving it for some kind of Lounge menu down the line, where they will assumably put stuff like the Jukebox.