Lost Kin Charm Combination?

[bobime, dorime, demomium]

Do you have any suggestions for Charm combinations to defeat the boss?

[GSandSDS]

Hmm, I don't remember the exact charm combination when I first beat him, but some of the underrated charms linke Spore Shroom or Defender's Crest might actually help this time. To be more precise: They help against these annoying balloon monsters because of their low life energy. Both charms produce an aura that will hurt enemies even though the damage is really low, but for the balloons it's usually enough. I think I used Defender's Crest when I beat him (the aura has lower reach but you are not forced to spend Soul for the effect). Also you can use charms like Fragile Strength without any risks. Since this is a dream fight that does not take place in the real world they will not get destroyed if you loose.

[rephian]

Tank him.
I defeated him without taking a hit (radiant version) using grubberfly's elegy, it was really easy since you attack him from far away and you have more time to react. If you are not fighting the radiant version, you can use a lifebloom charm to have extra blue health that allows you to take some hits and still use grubberfly's elegy wave.
If you prefer not to use grubberfly's elegy (for example, in the pantheons), go for a nail build (quick slash, mark of pride, fragile/unbreakable strength + whatever you find useful, like sharp shadow or Grimmchild). Beside that, just learn to read his attack. The only true dangerous one is when he charges you (he opens his eyes wide just before), and in that case just time your dash through him.

[Pajama Day]

Defender's Crest and Nailmaster's Glory are both good for killing the balloons and the Lost Kin themself.

E: Fragile Strength/Heart too because it's a dream boss.

[Doctor Fetus]

If you struggle against him go quick focus and sporeshroom charm (forgot the name of it). Normally you can't heal against Lost Kin thanks to his endless minions spawning around you but spore cloud protects you from them and allows you to heal a lot of hp since Lost Kin himself is pretty slow and gets stunned multiple times during a battle. This trick makes the fight very casual, you can play it poorly but still win. Of course it won't work against radiant Lost Kin.

[Krpa]

Get all pet charms and stay on one of the top corners.
He can't reach you, and the pets do the rest.

[Terratrox]

As long as you aren't fighting the Radiant version, you can run Stalwart Shell and the nail upgrades and literally beat him to death as long as you have enough masks.