Thanks for your input. I'd like to comment on some of the himes you mentioned:

Quote Originally Posted by Ogawa View Post
Sytry and Hebe are ok, but not as good as the above two.
I actually like Hebe, she helped me clear some Guild Orders before I got a full SSR team. Played turtle back then.

Quote Originally Posted by Ogawa View Post
Cyclops: Her kit is not that impressive, but she causes your entire team to have their HP boosted iirc, and that works even from the backrow. That means she is useful at any point in the game no matter how many SSRs you have, in theory. The best thing in her actual kit is a decent attack down debuff.
I think I didn't sell Cyclops well enough in my original post. She can be an healer of sorts, specially if team's HP is low. The Regen is capped at 750HP in 2 turns (1500HP healed in total), but Zeal subtracts a percentage of max HP (5% each turn). The heals plus Attack Down give the team more survivability, while the Zeal makes the team burst faster. To top it off, she has a quite rare (for Thunder) cleanse. Then take into account most SR Thunder aren't really team players, but more like "lone wolves". Cyclops is a good pick for she is one of the few team players.

Quote Originally Posted by Ogawa View Post
Fodla: This is a surprisingly versatile character that can fill different roles depending on what you need. She is probably slightly better in the backline, where she can heal your team and possibly delay enemy burst attacks. But in the front she can inflict thunder resist down, which is a lot like having an extra defense debuffer, except arguably better much of the time as it stacks with defense debuffs (and you're less likely to have thunder res down). Overall Fodla is pretty solid, but as a jack of all trades she unfortunately can't make use of all her potential at once.
I like Fodla on back row. Frontline Fodla is a glass cannon (Thunder Resist Down, some self-buffs, but Self Defense Down), backline Fodla is a nice reliable support (heals, eats orbs, has Self Evasion Up, making her a bit more survivable).

Quote Originally Posted by Ogawa View Post
Buer: To me, this is one of the most busted characters in the game period, even better than many SSRs. This may sound like hyperbole, but Buer can do something which (afaik) few to no other characters can do. Specifically, she can pop out potions. Popping out potions isn't free. It consumes a chunk of her health, and if you want to pop them out faster, it consumes even more health. However, as a general rule in a longer battle you will get 1-3 free potions, and the rest of the potions she makes you will have to use to heal her own HP. However, the 1-3 free pots alone makes it worth bringing her along at times. What makes potions good is that they aren't as limited as other healing skills, which tend to heal for relatively little, especially if they're SR heals. Potions on the other hand easily heal most of your health back up. But as if this wasn't enough, Buer ALSO happens to have a group AOE heal, which has a short CD that she can reduce even further by sacrificing her own HP, something few other healers can do. If she only had the group AOE heal, I would already include her on a list of best SRs just because of that. However, the combination of being able to make potions and heal your entire team really solidifies her as one of the best SRs in the whole game (imo).

Generally speaking, it's better if she isn't the one being targeted, but if she is, you can use the potions you generate to heal her, in which case she helped to mitigate damage for your team for free, similar to a tank. Either she's mitigating damage for your team by being targeted and healing herself, as well as pumping out occasional aoe heals, or she heals somebody else who gets targeted. One way or another, she adds a lot of sustain to a team.

I haven't tried her yet in labyrinth, but if she works like all other characters (CD refreshed for each new battle), she is going to be insanely broken. Starting at floor 1 you will be able to generate dozens of potions at no cost whatsoever.
I used to like Buer that much, but then I met Cernunnos (and got Osiris for some heals...). Cernunnos is the one thing that lets me survive Light Catastrophes and Hagith. Stackable Def Up, Damage Cut, Guards and heals herself.