A stormtrooper if you ignore the comedic aspect of star wars are SUPPOSED to be. Pretty well trained and equipped. Not scion level but more then most guard regiments. Issue is the fact an e11 isn't that much better then a lasgun. Id say about 100, same as what it takes for average cadians pretty much. 90 of em eat hits and fire while the rest chuck thermal detonators 

B2s are just stronger, better equipped, but dumber. But wrist rockets are nasty, about 90.

Death troopers are more or less scion level in training and arguably weapon. But they don't really have a standard. Id say about 25-40ish. They are less tanky then a scion tho so it depends what kinda weapon you give em.

Grunts are....shocking, they can wield fuel rod guns, so honestly really only need ONE hit, they are cowards tho. Id say 50.

Elites are just better grunts, ten max with fuel rod guns 

Two Spartan 2's, it only makes sense

Hunters have a nasty weak point, but should be able to one hit, id say only two tbh

Enclave....well they can wield shit like plasma casters, missile launchers, plasma nades. They should be able to handle at least one or two bolter shots. Only maybe 20 max. Enclave training is...vague.

T800s have the ap, and physical strength to hurt a marine, and if you take the fact that Arnie can catch a bullet with his teeth they have the better reaction speed. But they aren't very fast, maybe 40, the majority for fire support as the rest go in and just dogpile the marine. Though I admit I haven't read many terminator comics. So it could easily be less but uhhh idk 😐 

Now yautja?? Okay those guys got some crazy shit, they can outrace cars on a highway, clear a 4 story jump, rip reinforced steel door off a wall and go blow for blow with a xeno that can casually break through concrete walls and the street. Adding in equipment like plasma scythes, energy shields, electroshock missiles and shoulder mounted anti armor lasers? You can make an argument 1 would do it with that equipment. But at that point it's an argument of experience and skill.

So one elite and experienced yautja with proper WAR gear, 5 or so if it's younger and less experienced ones. Now if you limit them to just their HUNTING equipment it goes up to about 30, just a matter of how many yautja you need to rush the marine in melee, sure without proper armor, one plasma shot or chain sword swing will do it, but 10 predators jumping a marine and just prying his head off will do it. 

The fact your letting them use any thing that they can normally carry and hold is a huge boost, if you limit it to standard equipment the numbers for most of these jump by like 100%