Started this a long time ago, so let's do it again.
Ward hg: Seriously one of the most underrated; natural first choice for most people goes to C Wing, but this can replace Cyb Lhia in many cases (where there is already a lot of damage, and Ward hg would fit the theme).
Liam: People just remember Redra and Sasha, but Liam is probably just as good as those two, provided that Skeelz severely lack an SoA. People just build decks without him, but try to make a 3 2* deck with him if possible.
Ojibway: Somehow people just forgot about him, there was a time when he was banned every week... Still don't understand why. He is not as solid as lou, but has 2 increased damage used early, for a 10 damage that is almost irreducible.
Every time there's a FPC or an underrated card thread Sayura is mentioned, because she's an attack manip FPC, a 7 dmg 3* and a general pain in the ass. Works pretty well in her clan, tbh, and she's kinda underrated mostly because she was/is in the starter, otherwise she's one of the few low * FPC which doesn't lose a lot of oomph against SoB or -2 dr guys. Plus, when you have her in your hand it always looks like you're saving pills for her which leads to a lot of lol-KO's with other stuff.
Wesley is another card that kinda never gets mentioned, but is supremely cheezy, also has the problem of market price simply not reflecting how beastly he is most of the time, much like Tolliver (except Tolliver isn't underrated).
Gatline's underrated, judging by the fact that everyone always posts "Gatline for X" whenever she shows up in a preset.
Kati is underrated for sure. Never hear anyone mention her yet I seem to do significantly better with FPC when she's in than when she's not in, in any meta.
Baba is also a card which never gets mentioned, yet I've seen quite a few presets which got to 1400+ ELO with him in them. He's so obscure to me that I have no idea why.
I heard people find Walden surprisingly good as he ties 8 (and 9) power. Bonus points for looking terrible and then messing you up, way I hear.
Kati is an okay card but people likes to compare her with Bryan and Methane. Kati is obviously weaker than those two but she is already the best SOA in FPC. Same applies to Baba, whose clan does not have a decent SOA except Baba and Kristen, both are conditional though.
Gatline is pretty good but outclassed by other 4* in La Junta. Most decks contain Pilzken when he is not banned so there will be at most 2 4* cards in the deck (if 3 2*s are used). Brianna, Bryan and Arnie are all great cards to be used so we can't see Gatline often.
If Walden is underrated, then Darth is pretty much the same, though I doubt that it would be decent when facing those atk and power manipulation clans.
Walden and Darth don't necessarily have that much (more) problems with attack manip guys (compared to just about any other option at their * rank), as much as that they suck against Power manip clans (both + and -, and Roots and Gheist). Against attack manip they're kinda fine (in fact they're probably the best options out there against 8 power attack manip cards, and well, even throwaway SoA can mess a lot of sttack manip cards by 0ld losing). Against straight 8/9 power guys, they're probably the best choices in their clans, on top of also having technically superior damage (even if by just 1 point in waldens case).
They both tie-beat Elvis, Ongh, non-stop FPC, Xingshu, Diana, T-Gaank and a bunch of other stuff, which is kinda REALLY handy.
Alaba_Cr you were quite spot on with those comments.
Kati: Thing with kati is that, if you're using only Fang Pi Clang and you need a SoA, then go for her. But seriously, those are terrible stats and fang pi clang is almost always used in halfs, and so just get the SoA from the other half.
Baba: It is very interesting, there was a time I liked him a lot. Except I don't like 3 damage which is seriously not threatening at all, and conditional SoA is never too appealing for me. That said, he is definitely usable.
Speaking of which, Spicey is quite situational, but also very good potentially being an all stop at just 2*s.
Walden + Darth: Darth is superior firstly imo, since +3 damage is worth the star. Also, both are quite useless against SoA. Thing with these cards that really make them quite bad is that they never almost have an edge over any cards, and walden is especially bad because you never want to spend many pillz on a 2*. Darth is usable, but once again outclassed by other clan inmates.