We're about 80 strong, taken much as you were from multiple timelines of origin. Our captors, calling themselves "scientists" have names taken from the NATO phonetic alphabet.
Lima--about who we don't really know much--has a restricted access floor where specimens are given resources.
November (apparent Indian M 30s) has single person rooms, he's kind of a dick.
Echo (apparent asian F 40s) has her specimens in two person apartments, she seems to value books and logic.
Hotel (apparent multiracial M 40s) runs his block like a prison, two person rooms and regimented schedules, favors (favored) group punishments. He's probably the most communicative and present of our captors, though not in a benevolent way.
Romeo (apparent black F 50s) runs a pretty open block with single or double rooms, and a greenhouse.
Delta (apparent white M 50s) started as an experimental block from Steve Rogers (timeline we've been calling A), no longer here, gives his specimens a spare room for "creative purposes"
The most we've really gotten from them is that the brief given upon arrival. "Save the world," "study human nature," "form an ideal model of government" etc. They seem to delight in placing us for 2-3 weeks in high pressure or survival situations in "scenarios" that can appear as other worlds (1920s circus, medieval fantasy, etc etc) before returning here.
We don't get feedback on the results or have any insight into why or how people are brought here, but they're also taken away usually without notice.
That had slowed, until about two weeks ago when they shuffled our housing and started bringing in new people. With this shuffling, they changed some structural parts of the compound and assigned us jobs. We're still assessing what else has changed.
Our captors are powerful, they seem capable of neutralizing superpowers and moving us without our awareness in order to control us and set up new scenarios. But it does seem we have some capacity to influence our experience here. Captain Rogers (world A) seemed to prompt a new scientist, the cafe and several other features were added as a prize for a scenario, for a while people banded together to form a judicial and legislative system which the scientists tolerated until recently.