Soulker: Gloom stalkers will generally prefer to be in darkness rather than dim light so the first point of it doesn't have as much benefit to them (though it does still enhance their ability to stealth while not under ideal conditions)
the second bullet definitely boosts your ability to hide and attack creatures and be a monster to the monsters that would hide in the dark.
The third bullet is very nice as your dark vision sees darkness as if it were dim light and you have disadvantage on checks relying on sight in dim light which this negates.
Overall I'd say skulker could definitely be a useful feat for a gloom stalker.
The gloom stalker doesn't really have anything to do with social encounters or deception so whether you take actor would depend purely on your backstory and personality and how you want to role play your character.
Prodigy is very flexible and can work for just about any character, expertise in stealth would definitely be a very nice boost to a gloom stalker being able to terrorise monsters unseen from the darkness so that could definitely work.
Magic initiate is another really flexible feat that can work for just about anyone. I myself was just thinking about getting control flames for a gloom stalker character so I could snuff out any torches I came across allowing me to hunt at my leisure.
I'm imagining a gloom stalker approaching some underground dwarven (or whatever) fortress and climbing the ramparts and causing all the lights to extinguish as the guards are then helpless before my blade each reduced to a mere huddled mess or waving there arms about helplessly in the darkness that would normally be their friend as they hear the sounds of the other guards killed one by one.
Anyways long story short control flames can definitely help you as you can extinguish the flames from torches and other lights which would normally be a gloom stalkers biggest weakness.
Mechanically any of those feats other than actor definitely pair well with a gloom stalker, and if you think the actor feat would be fun and fit the character you made that's perfectly fine too. Whatever you like best should work fine.
Sent from my XT1635-01 using
EN World mobile app