Apathic to at best to the gender thing. In the way that he doesn't understand how he possibly conforms to the human standards but isn't bothered by it because at the end of the day, he views himself fundamentally superior humans.
On that note, Slenderman or whatever else he is called, is absolutely not his name, and he will never share what he calls himself.
If a proxy has written a diary/journey that retains any insight into Slender, he will destroy it, the proxy and any memory of the proxy.
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Proxies.
Although Slender doesn't understand humans for the most part finds their behaviour interesting.
The proxies are a way he can study their behaviour while keeping them in a (relatively) controlled environment. Like bugs in a terrarium.
This is why he has so many and protects them to some extent. He understands that he has a skewed demographic by it's still interesting to him.
He only values the proxies that have killed before, or are willing to kill without his hand being forced. Part of this comes from the interest in human social taboos and the other part is nobody is really going to come looking for them apart from law enforcement.
The closest he comes to caring about a proxy, is like a pet. Despite how much he comes to be fond of a proxy, he'll never see them as an equal, just a thing he owns and is responsible for the wellbeing of.
Due to this he feels no guilt in manipulating a proxy.
Best case it's like how we manipulate our pets in order to get them to take their medicine or something.
Worse case scenario is he needs them especially for whatever means, and since they're disposable he'll do/say whatever he needs for them to do it and then abandons them afterwards.
Only the proxies that are able to kill someone for him, fight the slender sickness long to find him are worth his time.
There are probably hundreds of 'failed' proxies that he's left to die from the sickness, this is a benefit to him because of the cognitohazard of the sickness that will eventually lead someone of note to him.
With his curious inquiry of human behaviour and viewing the most cared for as pets, he very rarely intervenes in interpersonal conflicts, the only time he'll get between two proxies if the one he has further need for is at risk of death.
That and he understands if one of them does kill another it ruins the sanctity of the safety he's promised inside the mansion's walls.
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Mansion.
Slender's physical anchor to the world.
In some way the longer Slender lingers in this place, the more blood that's spilled in his favour, and the more people that reside in it gives Slender more power and influence.
However this a symbiotic relationship.
The "Mansion" started a a mere cabin, what would be considered the foyer in current time. And nothing in the foyer or surrounding rooms can actually be broken by anyone other than Slender.
The pastas can't customise their rooms without express permission from Slender, any changes they make are reverted in real time.
The fringes of the mansion are the weakest and the most decrepit , there are mouldy halls that seem to grind into the soil, the mansion seems to have an ego and doesn't often let a pasta get that far into it.
On that note, the Mansion seems to have the psychic link to the pastas as Slender does, and they often find rooms based on vibes, and attempts to map the floor plans leads to a house of leaves situation.
But in order to not constantly disorientate the pastas there are some permanent and unchanging paths through the mansion.
This also works the opposite way, if Slender is upset with a pasta, the mansion will do it's best to disorientate the pasta in question.
While the mansion is a physical place, it moves.
Slender also has some control of the woods around the mansion, this is how it avoids getting discovered. Slender is able to confuse people's sense of direction so they are unable to reach it unless he wants them too.
He will do this the pastas aswell, them not being able to find the mansion is the equivalent of him locking the door and making them sleep outside for the night.
The forest can lead to any other forest in the world, the plants will seemly slowly morph in the local flora of the forest. This is entirely random.
And any forest can lead back to the mansion as long as the pasta has somehow contacted Slender, or has started to become subjected to Slender sickness.
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(I'm a fan of setting being a character and wanted make the mansion au seem a little more unique. plus it'll help with a grounded sense of place if I actually write/draw with the mansion au)
(and of course I'm all onboard with the collaborative effort of this whole thing, so feel free to use these or flesh them out as you choose, if you wanna.)
Toby: Being an adult must be great! Being able to eat all the junk food you want, not being forced to take showers, and no one forcing you to get up in the morning.
Masky: you are literally listing symptoms of depression-