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Non-elemental melee attack, combos up to four hits
Boggart is the latest in the line of melee combo attacks, and its big claim to fame seems to be its strength. It focuses a lot of damage on one target.
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. Pinning it with a Bond or Charm attack is the easiest way to deal with it, or you can just attack with your favorite Folk until you manage to hit it.
Charm elemental medium-long-range linear attack, can summon up to two at once
Coblynau is way too expensive for my taste, particularly for as narrow as its attack range is. You can score a lot more hits with Cu Sidhe or even Shefro.
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 straight-line attack, can summon up to four at once
There's a real glut of non-elemental attacks by now, and Mandragora is just one more entry in the list. It's faster than Hawk.
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.
Non-elemental medium-range straight-line attack, can summon up to four at once
The only difference I can see between Fachan and Mandragora is how long it takes them to lunge forward after you summon them. However, Fachan reminds me of a cluster of Bargest with no need to charge them, making them infinitely more fun.
How to fight it: Fachan doesn't seem to be vulnerable to anything but non-elemental attacks and Charm. It can lunge out of nowhere and catch you by surprise, though, so keep on the move and try to maintain a safe distance if possible.
Destroy elemental medium-range straight-line attack
If Coblynau was too expensive to be practical, Fomoire is even more so. Its power, at least at this point, isn't great enough to be worth the incredible cost, and there are plenty of other decent Destroy Folks, like Bargest and Gargantua. The best that can be said for Fomoire is that it's very fast, but considering that you can't use it again for a while, that doesn't mean much.
How to fight it: The Battlefield Cloak is probably the most important element of success. Fomoire hits hard up close and throws rocks from a distance. He's also got a ton of HP, so it will take a very long time to wear him down, during which Ulghter and Ulbyr will appear. Garbera will take care of those and also damage Fomoire, but the book recommends the Destroy element - Gargantua and Bargest are probably best for that. After two waves of birds, you can concentrate on Fomoire. Capture it with the Beat method.
Non-elemental melee attack, can summon up to four at once for wider attack range
Wryneck suffers from not being a combo attack, but its range makes up for that. In a large group of Folks, you can do a lot of damage with a few Wryneck attacks. Its high attack power and low cost certainly don't hurt its utility.
How to fight it: The problem isn't so much beating it, but beating it many, many times - Wryneck tends to show up in very large groups. Spreading Charm around with Cu Sidhe will help. Otherwise, fight it just like a large group of Boggart and try to collect as many Ids at a time as possible - particularly since you'll need a lot of them to unlock Wryneck's full potential.
Slash elemental very long-range projectile attack that curves as it goes, can create up to three blades at once
Either Beithir's attack meter lies, or everything I've fought with it is strong against the Slash element. Either way, it takes long enough to attack that it doesn't seem particularly practical. I find Fraxinus to be superior in most respects. It may be worth giving Beithir another try, though, maybe against some Folks like Bargest or Spriggan.
How to fight it: Non-elemental or Wind attacks are pretty effective, and Thunder works too. I happen to like Garbera for this. Block or dodge its blades and attack when you have an opening. Capture it with the Beat method.
Thunder elemental attack with wide range around Ellen
Baogbolc supplements the rather small collection of Thunder attacks we have nicely. It doesn't take too long to go off and hits enemies in a pretty wide area, as long as they're close enough to the ground. While its power-to-cost ratio isn't the greatest, there are enough Folks weak to Thunder to make it pretty useful.
How to fight it: Garbera is just as effective on Baogbolc as it is on Beithir, as are any non-elemental attacks you might favor. It's immune to Thunder, though. Its blades are electric, but otherwise the same as Beithir's. Capture it with the Stop-and-Go method.
Wind elemental medium-long-range projectile attack with tall area of effect
Baolwind's attack is as tall as Garbera's, but covers a greater distance. It stops if it hits anything, though, making it difficult to hit enemies near walls. It's still very effective in most situations, though.
How to fight it: Baolwind is the most annoying of the three scythe-wielding Folks to fight because its tornado attack will chase you down for quite a while. I highly recommend blocking that with a shield instead of trying to dodge it, although if it attacks while you're capturing a Folk, you'll have little recourse except for a well-timed dodge. Fight back with Thunder or non-elemental attacks. Capture it with the Beat method.
Water elemental projectile attack, range increases with Karma unlocks
Ulghter's attack might be useful except for two factors - it's really slow, and you have Peg Powler by now. I really don't see a purpose to Ulghter at this point.
How to fight it: It might take two hits from Garbera or Baolwind to draw out an Ulghter's red Id. If it swoops at you, get out of the way. There's no real threat here.
Bond elemental medium-range projectile attack
Like Ulghter, Ulbyr doesn't really meet any needs that we don't already have covered with Dracae.
How to fight it: It's an Ulghter that can shoot Bond attacks at you. Handle accordingly.
Wind elemental attack with an area effect around Ellen followed by a Thunder elemental medium-short-range linear attack
Morallta/Beagallta is probably the strangest Folk in the game. It can save you a slot if you need both Wind and Thunder elements in a single area, but the collection of Folks that both attacks would be effective against is pretty small, and you won't generally hit the same Folk with both attacks in one use anyway. It works best if you stand near a Folk that's weak to Wind and target a distant Folk that's weak to Thunder. If you're creative, it can be a pretty interesting addition to your arsenal.
How to fight it: Morallta/Beagallta has two forms. When it's fully colored, you need to hit it with Charm, and when it's black, you need to use Sleep. Cu Sidhe and Habetrot are my recommended Folks, but if you've got Caesg, that works for Charm as well. Its attacks are pretty standard dash attacks and shooting blades at you, which should be nothing you can't handle by now. Capture it with the Stop-and-Go method.
Charm elemental long-range projectile attack
Caesg is a decent Charm attack for covering a distance. It's nothing you really need, but it's far from bad.
How to fight it: First, capture every other Folk in Hellrealm, then kit up in the Cloak of the Deep and head back to the hot spring before the second Portal. The problem with Caesg is that if you kill or capture one, all of them will disappear, so use Habetrot to put all of them to sleep and draw out their red Ids, then capture one. Their water attacks shouldn't affect you too much if you're properly equipped, and they move in straight lines, so you can dodge them if you don't let them corner you. Capture it with the Timing method.
Wind elemental medium-range attack
Grindylow's attack serves a purpose similar to Baolwind's - a straight-line wind attack that gives you a bit of distance from the target. The main differences are that Grindylow's attack covers its entire range at once, whereas Baolwind's has to travel to its target; and Baolwind's attack begins very close to Ellen, while Grindylow's has a minimum effective range. The delay on its attack isn't unmanageable, and it could become a staple of your arsenal, particularly given how few other Wind attacks are available.
How to obtain it: Complete the "Mandragora, the Delicacy" quest in Chapter 5. The ability to tell Mandragora apart from Coblynau is essential to completing this quest within the time limit - unless you draw out all of the Mandragora Ids at once.
Thunder elemental attack with small area effect
Alhazred is essentially Mabinogion, but instead of spinning around for a while, it simply zaps any Folks in its range and then sits there uselessly. I still had a lot more success hitting things with Alhazred, so I consider it a step up in every respect that matters.
How to obtain it: Complete the "Urisk Gathering" quest in Chapter 5. THe only trick here is in killing the Folks quickly enough - hit them with Garbera and Baolwind as much as you can and capture them quickly.
Water elemental trap-style attack with area effect, activates when hit with enemy attack, can summon up to two at once
Phutcampus sucks. It's an interesting idea and certainly had to stand out to be worth the DLC purchase, but the need to be attacked in order to attack makes it unpredictable, and I still don't see anything wrong with Peg Powler for all your Water needs.
How to obtain it: Buy the DLC pack containing the "Lost Thoughts" quest and complete both parts, first available in Chapters 3 and 5. There's not much to either of these quests beyond fighting Folks from Warcadia alongside Folks from other Realms, but pay attention to the special conditions in the second part of the first quest.