I would like to bring in this girl as Belphegor, the Demon over the sin of Sloth. Don't let her adorable looks and baby-charms fool you. She is trouble personified, ruthless, cunning and wildly deadly.
A lot of people take sloth to mean laziness but obviously sins can be viewed in different lights and different conclusions drawn to their meaning. I see her sin as more Peter Pan Syndrome. Mikka likes games and toys and obviously to puppet people as such and her goal in life is to get people to skirt their responsibilities by playing into their childish sides. With her attitude, she can get you to think murder, mayhem and crime are super fun games and certainly better than whatever it was you were being made to do to begin with. Mikka's job is to make you forget your responsibilities and to not have a care in the world except for yourself so she loves to give you temptation to procrastinate and forget everything. She loves apathy and is rather apathetic to others.
I can use lines of all kinds and would love any feedback on her because I know it's quite a different take than what some people might be expecting from a sloth demon. I would especially love for her to know others who would like to have fun (ha, her version of 'fun' might be very different than yours).