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Non-elemental melee attack, combos up to four hits
Boggart is yet another melee combo attack - I don't like it as much as Pouke or Brollachan because the second and third hits of the combo have even shorter range than usual. It's there if you like that sort of thing, but I don't think it's particularly useful.
How to fight it: The main thing that separates Boggart from its kin in earlier realms is that instead of charging forward, it dodges backward when you attack it. Ranged, continuous attacks like Kraken, or area attacks like Afanc are more likely to hit it.
Fire elemental very long-range projectile attack, combos up to two hits and creates pillars of fire on impact
Urisk would probably be one of the best Fire Folks if Durandal didn't come up later in the same chapter. It's the first ranged Fire attack we've gotten - until now, all we had were Hinky-Punk and Volcano. Unfortunately, Urisk isn't particularly easy to aim, particularly if you're trying to hit the ground under a high-flying Folk to catch it in the pillar of fire. You'll get the most use by aiming at a wall near the target, assuming your target flies into walls.
How to fight it: Obviously, the Ice element is your friend here. Interestingly, I found Selkie to be particularly useful, and Aughisky works as well. Kraken is, as always, the Ice Folk of choice. Urisk can be annoying to hit (although Kraken will make short work of it, naturally), but it isn't usually much of a threat. It shoots fire at you sometimes.
Ice elemental medium-long-range projectile attack, splits into up to five shots
Just what we needed - another Ice element attack to go with the six we already had from chapter 3. Ulhgik has a pretty nice spread, but Kraken covers that entire range a bit at a time. I just don't see myself using it very often. It's good against large targets, where more than one of the ice projectiles will hit it.
How to fight it: It's a bit tougher than Urisk just because you don't have the same variety of Fire attacks, but you can either pin it to a wall and hit it with Urisk or wait for it to swoop at you and use Volcano or Hinky-Punk.
Earth elemental short-range attack with wide area of effect
Coblynau lunges forward and creates a tremor in front of it - and once you've built up its Karmas, to the sides as well. It's easier to aim that way than some of the other Earth Folks, but really doesn't seem to be much more effective against single targets than any of the others. It would do wonders against groups, but then, so does Habetrot.
How to fight it: Coblynau sometimes appears in the area west of the start of Hellrealm, where the Mandragora appear. You can recognize it by the increased sparkles around the bud, the color of the stem, or the fact that a Coblynau pops up instead of Mandragora when you attack it. Coblynau pops up alone, rather than summoning all the Mandragora along with it, so it should be pretty simple to combo it to death with whatever Folk you've got equipped.
Non-elemental medium-range projectile attack, combos up to four hits
Mandragora is a pretty good Folk for keeping a distance while doing damage to Folks vulnerable to non-elemental attacks. The throws don't all go quite straight, but they usually hit the targets well enough. It's got a bigger hitbox and, as far as I can tell, a bit less downtime than Bullseye, so you can throw one or two and then move if you need to. And it's just fun to hurl plants at your enemies.
How to fight it: When you hit a Mandragora's bud, all of the Mandragora and Coblynau in the room will pop up to attack you simultaneously. When you kill or capture one, they'll all dig back underground and spend a few seconds moving around, impervious to your attacks. In the meantime, I'm sure they attack you, but I've never found that to be an issue. Lashing out wildly with Pouke works pretty well, and if you can draw out multiple red Ids at once, it'll save you a few iterations if you're trying to clear the room.
Destroy elemental melee attack, combos up to four hits
Fomoire is a powerful attack that hits high, so while it can miss targets on the ground sometimes, it can hit Folks like Kalmia out of the air. The only real problem is that it's expensive - you only get six hits on a full MC meter. Fortunately, you won't often need more than that.
How to fight it: Keats has plenty of Destroy element Folks to choose from - Gargantua and Brummbear are useful for keeping a distance, and Ga-dearg works well close up. It's also vulnerable to Fire and Ice, which will be important when Urisk and Ulhgik start to appear. I recommend taking out the birds first before concentrating on Fomoire. Capture it with the Beat method.
Non-elemental short-range attack with small area effect
Kalmia is sort of an inverse shield - instead of blocking damage, it deals damage to anything that gets too close. The slight pause before it takes effect makes it cumbersome to use, though. I do like the height of the effect area, though - you can hit Folks above you.
How to fight it: Try to avoid tearing your hair out. Difficult, I know. There are two problems with Kalmia - hitting it while it's flying, and avoiding its swooping attacks. I recommend giving up on the latter - it's just going to hit you. If you do avoid its swoops, though, it'll hit the ground and lie still so you can hit it a bit. As for hitting it while it's flying, Fomoire and Kalmia are effective, but be careful of its swoops. If you can hit it with an Ice attack, it'll freeze for a bit, giving you an opening to attack it. Afanc or Selkie (if you can target it effectively) would be effective.
Slash elemental very long-range projectile attack that curves as it goes, combos up to four hits
Finally, a long-range Slash attack. Alas, it's just as weak for Keats as it is for Ellen and takes forever to do the amount of damage you need. It's good for keeping you at a distance from your enemies for a very, very long time.
How to fight it: Stay away from its slash attacks and watch for projectiles. Non-elemental attacks work about as well as anything else, as far as I can tell. I found Mandragora to work pretty well. Capture it with the Beat method.
Slash elemental melee attack, combos up to four hits
Baogynis is basically Answerer with a much bigger attack area. It's cheap and effective, and can probably replace every other Slash element Keats has for a while.
How to fight it: It's more or less identical to Beithir. Fight it the same way and capture it with the Beat method.
Destroy elemental medium-range charging attack
Baolydead sweeps out a nice, wide path and mows down everything in its way. It's a great way to close the distance to an enemy so you can hit it with a Ga-dearg combo. I love it and use it all the time.
How to fight it: It's mostly identical to Beithir and Baogynis, but where they're immune to Slash and vulnerable to Destroy, Baolydead is naturally the other way around. It does have the charge that it will use when you've captured it, so watch for that. Capture it with the Stop-and-Go method.
Fire elemental long-range projectile attack with wide area of effect upon impact
Durandal pretty much blows most other Fire attacks out of the water, so to speak. It's a big fireball, so it's easy to hit with, and even if it misses the target, the explosion might well do the job. The only downside is that it costs half your MC per attack, but it's worth the cost.
How to fight it: Don't forget to raise your shield as soon as the elevator stops, because this fight begins with Durandal charging straight at you, leaving a trail of fire in its wake. It can also spit fire or just slash at you with its claws. The approved method for fighting it is to hit it with Ice from a distance - I think Annwn is the best choice for this - and then Earth while it's frozen. Earth will hurt it even if it's not frozen, but it will hurt you if it's not frozen, so make of that what you will. Capture it with the Stop-and-Go method.
Non-elemental short-range attack with wide area effect
Langelaan is the sort of Folk I keep forgetting I have - non-elemental attacks just don't have the flair to be memorable. It's a shame, because Langelaan is a visually impressive attack that hits hard and covers enough area to hit plenty of targets. It's basically a non-elemental Earth-style attack.
How to obtain it: Complete the "Stolen Bottle" quest in Chapter 5. You're on a timer, but it's generous - once you've cleared out the first floor room and the elevator, it will stop. Then just find the second-floor room with the single Boggart in it and kill it.
Earth elemental short-range attack, chargeable
Keats has enough Earth element attacks by now that don't require charging for full impact that Yarthkins just seems too slow to be relevant.
How to obtain it: Complete the "Starving Beithir" quest in Chapter 5. If you've built up Baogynis and Baolydead a bit, this will be easier. Building up Beithir is unlikely to improve your performance much.
Slash elemental melee attack, combos up to four hits (spits short-range projectiles on final attack)
Grab Bag is a present that spits presents. It would be a beautiful attack if it sucked, but it's surprisingly effective for what's essentially a gimmick Folk.
How to obtain it: Complete the "Holy Night Visitor" DLC quest in Chapter 5. It's a pretty long quest, both in terms of the story and the number of Folks you'll have to fight. Save as much HP as you can for the final room, where you'll have to fight a Bargest with two Bug-a-boos and a bunch of Kalmias. It's worth the effort, though, since you'll get Grab Bag for both Keats and Ellen.