Okay two things... I think that most of there ideas could already be roleplayed - and be lore compliant.
See the thing about making Shadow Creatures? Well the Strings form of magic can animate objects using it's Puppet Magic.
"Strings Magic allows the user to animate inanimate objects. The objects have to be movable however, a Strings Mage cannot animate a rock or tree. Items favored by Strings Mages are sets of armor, mannequins, puppets and such. Strings Magic only knows one specialization, Puppet Magic."
So then wouldn't that be similar to making Shadow Giants?
And then the idea of 'turning out the lights' or making Shadows cast people into darkness would fall under Hex Magic, right? Either Nightmare - or Twisting Hex, depending on how this would be portrayed..
"The second form is Twisting Hex. It allows the Mage to disguise a person or object into something else, making others believe it is not what it actually it. The next form is Nightmare Hex. This is the rarest form of Hex publicly seen, where the caster changes the view of their target into a demonic nightmare version. Any and all Hex forms require the Hex Mage to be in viewing range of the Item or Person they are influencing. Breaking the line of sight will cancel the effect."
I like Shadow Magic a lot.. but in my opinion it's just based on the Shadow Plane. I want to make a Shadow Mage character - and to me the Shadow Plane is just a bunch of doors that can change their positions depending on the light. I know I might get a lot of hate for this - but in my opinion Shadow Magic is more of an elusion or defense tactic, instead of an offense, and should stay that way..