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Non-elemental medium-range attack with knock-down effect
As far as ranged non-elemental attacks go, Thrumpin isn't too bad. But it's not too good either. The knock-down effect makes it hard to follow up its attacks (although Thrumpin itself seems to be able to hit downed Folks), and it doesn't exactly combo. By this point in the game, the Warcadia Folks in particular are so strong that Thrumpin doesn't really measure up.
How to fight it: It's identical to Killmoulis in both attack and defense patterns - pick your favorite attack and hit it while its shield is down. Its attacks shouldn't even be an issue.
Non-elemental short-range attack with area affect, chargeable
Luideag is another Chapter 4 Folk that seems redundant to me - you plant it a short distance away, and while you can move around a bit while it charges, you won't be dodging any attacks that way. When charged, Luideag sweeps its blades in a full circle, but you get much better coverage from Bug-a-boo whether you charge it or not, and in either case, it's an awkward attack to use effectively. Maybe the highest charge level has some amazing property I haven't seen, but then, Bug-a-boo's fully-charged attack covers so much ground that I really don't see why you'd want to switch it out at all.
How to fight it: Keep on the move to avoid its lunging attacks, and hit it when you can - Bullseye is as effective as ever. You can even put it to sleep if you're so inclined.
Wind elemental medium-short-range attack with wide and tall area of effect
Garbera's attack is probably especially handy if you didn't download Quasarilli, because it would join Boobrie as part of your very limited selection of Wind attacks. Even with three to choose from, Garbera is the only one that can hit flying targets, and is effective against slow-moving enemies at close range. Quasarilli might be good for more hits and more damage overall, but it's less predictable and can be attacked before it finishes its sweep. I think Garbera's a pretty solid choice.
How to fight it: Garbera's attacks are all in the form of wind, moving in a straight line. When you have one alone, it's relatively easy to dodge the attacks, and they don't hurt very much anyway. Non-elemental attacks work well enough that I've never bothered to try any other elements for effectiveness.
Non-elemental short-range melee attack, combos up to four hits
Brollachan is the first Folk that could be a replacement for Pouke once you've built it up. Pouke has a reach advantage, but Brollachan has a leaping attack for its fourth hit - your call which one is better for any given situation.
How to fight it: When facing a large group of Brollachan, Charm is your best bet. Otherwise, they're pretty much the same fast-moving, close-range-attacking Folks you've faced in every Realm so far. They're a great source of Green Ore, at least, if you don't feel like grinding from Worthhog (you don't).
Thunder elemental short-range attack with wide area effect
Mabinogion is of questionable use at best. It takes a while to start attacking, during which time it can be attacked and destroyed, and once it starts up, it uses up to four tendrils of electricity that slowly spin around it - most of the time, Folks can waltz right through and attack it. It's almost impossible to judge the distance to a stationary target, and difficult if not impossible to use effectively against moving targets. I'm told it's useful as an offensive shield when paired with a defensive shield, but I don't feel like worrying about that. If you have good results, good for you. I think even Candela is probably a better choice for this sort of Thunder attack.
How to fight it: Peg Powler. I suppose it has swooping attacks and that same lightning attack it uses when you summon it, but Peg Powler makes all of that irrelevant.
Sleep elemental attack with wide and tall area effect
Habetrot is a GOOD Sleep attack. You might as well never use Cait Sidhe again. Habetrot activates almost immediately and puts every vulnerable enemy around you to sleep, including flying enemies. If you didn't want to put forth the effort to capture a Shefro earlier, just toss Habetrot at it a few times and the deed is done.
How to fight it: Habetrot is the only miniboss you'll fight in the Endless Corridor, and it's more annoying than difficult, especially if you're wearing the Faery Cloak. First, only one will appear; once you defeat that one, it will appear in groups of two, four, and finally eight, at which point you'll be able to capture it. Destroying the real body in any group will dispel all of the copies, although they'll remain while you try to capture it, so make sure you clear out the seven fakes first. If there's a way to spot the real one from the fakes, I don't know what it is, so I just use Bullseye or Wind attacks to wipe them all out. The biggest challenge is the timer that appears on repeat visits - you'll have to finish the fight before the timer expires to get a prize. I think this is much easier with Ellen than with Keats. Capture it with the Stop-and-Go method.
Thunder elemental straight-line attack, range increases with charge level
Humpty is a strange Folk to use - if you don't charge it up, it's pretty useless, but once it's charged, it can be pretty effective. It will alternately punch whatever's in front of it, then leap forward and punch again, adjusting its aim if it's attacking an enemy that gets knocked aside. Most of its Karmas aren't available until Chapter 5, but if you can find the time to charge it up, it can be pretty effective even this early - especially at very close range, where its initial punch will also hit the target. It's okay at a distance, but really shines if you can land three or four punches in a row.
How to fight it: It's immune to everything while it's inert, so you'll have to wake it up with a Thunder attack. Once it's moving, you can smack it around with non-elemental attacks until you can capture it. Wind attacks also work, but aren't as effective as non-elemental. Its attacks don't seem to be much of a threat, but you might want to keep your distance. If it runs out of power, it'll turn off again and you'll need to wake it up.
Destroy elemental medium-range attack, straight-line charges, can summon up to four at once
Skriker is a more useful version of Coropuna - which isn't saying much. It's small, so it can get under some enemy attacks, but you have to be able to judge timing and distance to score hits with it. That's less of a concern once you've unlocked the Karmas that let you summon multiples of it, but even at that, its cost makes it prohibitive to summon too often.
How to fight it: Peg Powler. It can only charge straight at you and explode, so stepping out of the way is completely effective, and all it takes is one Water attack to draw out its red Id. The hardest part of the fight is that it can only be found in the first Tower Brahma, where capturing or defeating any Folk will restart the room.
Slash elemental short-range attack, combos up to four hits
Answerer is a pretty good Slash element attack, but it's not nearly as important for Ellen as it is for Keats. Ellen gets a lot of mileage out of Fraxinus, particularly over long distances. For short range combat, Answerer is probably more effective than Ogma due to its speed and combo attack.
How to fight it: Answerer is annoying to fight because it has a frontal shield, and even with the shield down, it's immune during many of its combat animations. Keep your distance, and it won't be able to hit you. Wind element attacks are particularly effective, and hitting it with enough Thunder will stun it. Non-elemental attacks work as well, so Hawk or Barrager will work well.
Omnidirectional shield, can sustain any number of hits
Spriggan is the best shield in the game, hands down. It will block any attacks until you run out of MC. I really don't think there's any reason to use Killmoulis or Patriot once you've built up all of Spriggan's Karmas.
How to fight it: On its own, Spriggan isn't a very tough fight. The problem is that you'll never see it on its own. Spriggan only appears in the second Tower Brahma, where you'll have to leave the Mabinogion alive while you fight Spriggan. Fortunately, Mabinogion likes to keep its distance and be a non-entity in the fight. Spriggan has a barrier that prevents all damage until it attacks, so you'll have to get close to draw its attack, then hit it before it raises the barrier again. Slash attacks are the way to go here - Fraxinus is probably your best bet, but Ogma or Answerer can be effective as well if you don't mind getting close. If you do enough damage, Spriggan will fall apart and be helpless for the final attack or two. Capture it with the Stop-and-Go method.
Thunder elemental attack with wide area effect
Candela covers a large area with electricity, making it a great attack aside from a very long windup. It can still be effective if you plan carefully, such as using a shield to protect it from enemy attacks, but I wouldn't expect to get much use out of it against bosses.
How to fight it: First, you'll need to capture every other Folk in the Endless Corridor. Candela will then appear in the very first room. Basically, the fight is the same as Humpty, except that Candela takes more effort to bring down, and if you don't finish it in time, it will self-destruct. I recommend alternating Wind and non-elemental attacks - something like Quasarilli or Garbera that keeps attacking while you switch to Pouke or Brollachan. It's best if you only activate one at a time, just to have as many chances as possible. Capture it with the Balance method.