The very first thing LA would mention about this second season is the absences of Rie Matsumoto, the director of the first season who brought that zany flair she added to Kekkai Sensen that will be sorely missed in this season but nonetheless, this season helmed by Shigehito Takayanagi (Director of Dagashi Kashi and both season of The World God Only Knows) tries to emulate Rie's vision in his own way as well as pay respects to Rie all into this second season with great results.
For one, Kekkai Sensen's episodic nature is back and takes a more character focused narrative this season by bringing us perspective from the various main characters of Libra and giving us their daily lives of them.
The funniest thing is, many of the episodes even pays homage to media references (which is probably Yasuhiro Nightow's influence, the author of Kekkai Sensen), from paying homage to Batman, Akira and Godzilla among others.
Character-wise the development of the minor cast of Libra was a good step, from Gilbert F. Altstein, Chain Sumeragi, K.K, Zed and Steven A. Starphase. LA's favourite would be a tie between K.K and Chain's episodes and involvement in several of the off-handed non main character focused episodes. LA felt that Klaus didn't get as much as the rest of the cast though he was linked to a Demon Hospital episode that had at least showed his resolve before Hellsalem's Lots actually became a thing. Now Leo's actual character focused episode doesn't show up until the final 2 episodes of Beyond and it involving Michella, you know it was gonna get serious. Before all that it hinted us the audience that Leo wanted to get rid of the curse of his All Seeing Eyes and culminated into the final episodes into something as bombastically intense as it did, with a villain Leo faces who surpasses him in terms of supernatural power.
Animation and voice acting wise, it has all the feel of the first season, with the crisp and zany battles that Libra goes through and all the alien nature of the anime taken as normalcy. The animation done by Bones is once again great and consistent all throughout from both the first season and this one. Voice acting wise, LA thought Yuu Kobayashi and Ai Orikasa got to use more of their acting chops during this season and it paid off. Daisuke Sakaguchi who voiced Leo is his normal yet zany self and his over-exacerbated reactions are great as always. What's great for the voice cast for LA would be Nana Mizuki as Michella and in voicing Leo's kind hearted sister (LA says this as Nana usually voices the badass character) but LA has this thing with Nana Mizuki where LA can't displace Nana Mizuki from Tsubasa from Symphogear, but nonetheless with all this rambling, the voice cast is expected greatness.
So if you thinking with the change of directors and change of plot focus would deter you from liking this season of Kekkai Sensen, LA would say you can rest easy as it still has the same vibe to the original and given the character development to Libra actually working it's own advantage, the same animation studio pegging this season and the voice cast being as amazing as always, Beyond quite honestly eviscerated any notion that this season would go down on the wayside with what passion, homages and emulate the first season to this season own unique greatness!
