Charm points are slow to earn, so the plan is solved for the whole hunt at once.
This is the most opinionated advice on the site, and the most expensive to get wrong — charm points take a long time to earn and moving one later is a real cost.
Cobra AssassinEnflameVampiric Embrace55%
Cobra ScoutWoundVoid's Call29%
Cobra VizierDivine Wrath15%
Example Cobra Bastion
One plan, not one answer per creature
Asking "what is the best charm for each creature here" gives bad advice, because the answers overlap: three creatures can each be best served by a different charm that solves the same third of the spawn, and following all three spends points three times on one problem.
So the hunt is solved as a whole — which sometimes means the charm shown for a single creature is not the one that creature would pick alone.
Majors follow what the hunt is made of
A major charm does elemental damage, so its worth is the creature's sensitivity weighted by how much of the hunt that creature is. A charm that hits hard on something you meet six times an hour loses to one that hits adequately on the four hundred you kill. The mixture is the input, not the creature list.
Minors answer a different question
The four minor charms respond to what the hunt does to you, so they are planned alongside the majors on their own reasoning — ranked on damage they would always lose.
A drain is judged by how long the hunt leaves you standing in it, not by whether it happens: a little drain across most of a spawn's health is a worse problem than a lot from something that dies immediately, and the second is what looks worse in a list of abilities. Same for a charm that punishes fleeing, or one that leeches back.
What the plan does not know
Which charms you have unlocked, or how many points you have. It assumes the choice is open, which makes it a target rather than an instruction.
That you hunt somewhere else on Tuesdays. A charm is a lasting commitment and this page is about one hunt — if you split your time, compare the two plans and take what they agree on.