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Non-elemental long-range projectile
Telanthera would probably be a great attack if the much faster Bullseye didn't exist. Telanthera doesn't combo and its claw moves slowly, so I don't find it as practical as simply using Bullseye and shooting a bit more.
How to fight it: Keeping your distance is best, although that's no guarantee of safety. Telanthera uses a number of highly annoying wind attacks and also shoots claws at you with limited homing capability. Then it disappears and reappears elsewhere. Try to be patient and whittle away its health with Bullseye and Barrager, or Slash attacks like Grab Bag or Alonedite. Agar-Agar is recommended for defense if there are any other Folks around.
Fire elemental medium-range projectile attack that shoots three projectiles in an arc, creating tall pillars of fire on impact
Bougainvaillea (there's a mouthful) would probably be more notable if it came before Durandal. As it is, it's nearly impossible to target because the fireballs arc over most targets, and at the distance where the fireballs will hit things near the ground, they've spread out enough that most Folks will be in the gaps between them. It costs about as much as Durandal as well. If you practice your aim, I'm sure it's handy, but this is the last chapter. When are you going to practice?
How to fight it: Do I really have to write this section?
Okay, okay. You have to use Ice attacks, preferably anything that lets you keep a respectable distance and move freely while retaining enough MC to put up a shield as necessary. So... probably Annwn and maybe Ulhgik. Bougainvaillea tosses waves of homing fireballs at you, which you'll pretty much have to block because dodging them is nearly impossible. If there are multiple Bougainvaillea in the room, put up Agar-Agar and hope for the best. Worse yet, if you have to kill one, try to get behind it before landing the killing blow, because it'll send out one final wave of fireballs as it dies, and you won't have time to block.
Destroy elemental short-range attack with wide sweep
Gladiolus is really strong and really expensive. Without the delay before it attacks, it would probably be a great Folk. For Keats, it's still a pretty good Folk, but he has no shortage of other, cheaper Destroy elements to use.
How to fight it: Gladiolus tends to chase you down relentlessly and either swing a fist downward, spin its fists around, or sweep two lasers in front of it. If it's floating, guard its attack and fight back with a Destroy attack of your own. The other attacks can be dodged by keeping out of range. Hit it enough, and it'll fall apart like a Spriggan. Capture it with the Beat method.
Ice elemental short-range continuous attack that can be swept sideways
Protea is a smaller, slightly cheaper Kraken. It's probably great if you didn't find Kraken. If you're following this LP, you found Kraken. Use Kraken.
How to fight it: Hitting it isn't that big a problem. You've got Durandal, you've probably got Bougainvaillea, and if you haven't got Agapanthus, you will soon. The problem is that when you hit it, you have to wait to see whether the red Id pops out, because that tends to take a while. I suppose its attacks are also worth worrying about, but the main one to watch for is a giant wall of ice, and I really don't know what to do about that other than stay away as much as possible and, if you get caught in the ice, get out of the affected area as soon as possible.
Ice elemental medium-range linear attack with wide spread
Protta's handy in situations where simply having an Ice attack is more important than how powerful it is, such as enemies vulnerable to freezing. It's not necessarily better than other Ice elements you have, especially since you have so many of them by now, but it's another choice and not a bad one.
How to fight it: Like Protea, the challenge with Protta is mainly drawing out its Id without killing it accidentally. You've got enough Fire attacks with large areas of effect that hitting it isn't much of a challenge.
Fire elemental short-range attack with tall area of effect
Agapanthus is an unexpectedly useful Folk. While it requires you to get into melee range, it creates a pillar of fire that's easy to place exactly where you want it, making it a great choice against flying enemies. It's really strong to boot.
How to fight it: While it's wearing its armor, only Destroy attacks will be effective. Hit it a few times, and its armor will break, leaving it vulnerable to other elements, although Destroy continues to be effective, so there's no real pressure to switch. Capture it with the Stop-and-go method.
Slash elemental short-range attack with wide sweep
Bergamot is a Slash attack that doesn't seem to have any interesting distinguishing features. It slashes things. Baogynis and Grab Bag do that too, with combos.
At least it's still better than Beithir.
How to fight it: Fighting at close range is risky, because Bergamot will usually scuttle backward, out of the way, then hit you with its tail. Long-range attacks will negate that attack, but you'll still need to watch for its ice breath. If it rears up, move to the side or back to get out of its range. Capture it with the Timing bethod.
Destroy elemental short-range attack
Ammobium is probably one of Keats' best Destroy element attacks. It comes out quickly, hits reasonably hard, and tends to knock down anything it hits. Folks like Ga-dearg and Andraste can be pretty effectively stun-locked.
How to fight it: It's mostly a less slashy version of Bergamot that can be captured with the Shot method, so it's not a threat even if it's not alone.
Non-elemental melee attack, combos up to four hits
Every realm has to have a non-elemental combo attack, doesn't it? The one in the Netherworld Core comes way at the end, and it's probably the slowest and most powerful of the lot. There's very little to say about it by now.
How to fight it: Goggie isn't very dangerous by itself, but if you hit it enough to kill it, it'll hatch into Amaryllis instead of giving up its Id. If you want to capture it, you'll have to be careful how much you attack it. Otherwise, it's no different from Ammobium and Bergamot, really.
Ice elemental short-range attack with area effect
Amaryllis is an interesting Folk, in an element that was saturated before we got three new ones in this chapter. Against single targets, it's hardly the first choice, and if you're surrounded, it's great, but a bit less effective because of the short pause before it starts spinning. I don't really bother, but it's a fun Folk to use if nothing else.
How to fight it: You'll need to use Fire if you want to draw out its Id, and when it takes to the air, that probably means Agapanthus. When it's closer to the ground, just about any Fire attack will be effective. Its ice swords will hit in a wide area around it, but you'll have a second or two of warning before they start moving - get clear or put up a shield. Amaryllis also drops ice blocks on you, but you should be used to that from dealing with Selkie. Capture it with the Balance method.
Slash elemental long-range projectile attack
Alonedite is the Keats equivalent of Fraxinus for Ellen, and I think I've made my thoughts on Fraxinus pretty clear. Alonedite's attack seems weaker, but it's the attack pattern that really makes it worth using. Keats doesn't get many good long-range Slash attacks, and this is pretty much the best of the bunch.
How to get it: Complete the "Wavering Flame" quest in Chapter 7. The only part of this quest that's anything other than standard fighting is the final room, where you'll need to use the room geography to keep the Telanthera away while you kill the Bougainvaillea. That's as difficult as it gets.
Slash elemental medium-long-range linear attack
Scarab sweeps out a wide area as it flies in a line, slashing everything in its path. It's most effective against groups of enemies, but works well against single targets as well. The fire-and-forget nature of the attack keeps you on the move as well.
How to get it: Complete the "Alchemy Assistant" DLC quest in Chapter 7. There are many strategies for choosing which stones to break for each of your two trips, but I recommend taking all of the red and blue ones for one trip, so you fight a single super-powered Folk in each room, and then all of the yellow and white ones for the other trip, so you fight a horde of completely normal Folks.
Fire elemental long-range linear attack with rising area of effect
Automata is simply probably the best Fire attack in the game. It's so expensive that you can only use it once per MC meter, but especially once you've raised its effect area, you generally won't need more than that. Just be careful not to kill any Folks you're trying to capture. It can hit flying Folks, Folks at close or long range, Folks that move quickly - just about everything will melt. And it is good. The only downside is how long it takes to build up - but once you get over that hurdle, there's nothing stopping you from using Automata for everything.
How to get it: Complete the "Roots of Fear" DLC quest in Chapter 7. You probably want to ignore the Folks until you get to the Fomoires, although it's a good idea to capture as many as you need to fill your Transcension gauge. Attacks that cover a wide area and can hit more than one Fomoire at a time are recommended, because each time you kill one, the others will become stronger - weakening them ahead of time will reduce the amount of damage you'll need to do to finish them off. Activating Transcension will nullify the increased damage that they would otherwise deal to you.