Regressor Dorian headcannons because he's my special little guy
He spends a lot of his time in fight or flight, constantly aware of the comings and goings of everyone in the house, and he fears that taking a break will lead the people he's trying to protect getting hurt. He takes his job very very seriously.
This means that Dorian rarely takes a break- like some other objects in the house...- and his regression is involuntary due to stress/burnout from his work and being on alert all the time.
I think his age range would be all over the place, just depending on how stressed he is, and how much of a threat his brain still believes there to be. Like high stress + high threat = very distressed baby Dorian, but high stress + low threat = middle/teen Dorian, if that makes sense?
Dorian, unless he's regressed very young, will avoid/hide from the other objects because he doesn't want them to perceive him that way. He's meant to be strong, keep them safe, and how will they belive he can do that if they catch him crying and acting a quarter of his age? So he does his best to avoid them.
Sometimes it's unavoidable, depending on where he is when he regresses, because some of the other objects have fantastic caregiving instincts and will clock him before he can make his escape.
Not a particularly cooperative little- he is stubborn, and since his regression is normally negatively triggered, he's almost always processing big, strong emotions that he does not feel equipped to handle, and being regressed, he struggles to communicate these feelings and it ends up becoming very frustrating for him, and his CG at the time. Another reason why he avoids them.
Likes to be carried/held
He sometimes reaches a point in regression where he stops fighting things, let's himself be upset and process his stress and emotions, but this is very rare, because he's more likely to regress, freak out, and then eventually claw himself out of headspace and pretend absolutely nothing happened. It takes a talented CG to help Dorian go through the, much healthier, first process.
Will suck/chew the keys he keeps as a necklace. Good indicator that he's regressed/regressing and trying to fight it.
A good mix of active and eepy baby, hes quite happy to play a physical game, but also to just relax and snuggle.
I do think, over time, Dorian would start to accept his regression more, and it may even become something he does voluntarily before his stress becomes unbearable.
Okay that's all I've got for now, hope you guys enjoy!! Feel free to send requests for any date everything character and I'll do my best for oblige <3