ferns-corner asked:

Who are Mika's closest friends or people she trusts enough to tell her secrets?

Mika closest companions are understandably her older sisters due to her sheltered lifestyle.

Though she has been seen hanging around Queen Bee and Mochibun

[To Answer Your Other Question:]

1. Does she have any powers? 

Yes, she does! Her healing powers are exceedingly above average and even her mothers Queen Mikayla healing powers fall short. She also has psychokinesis as her major magical ability.
Her minor magics include night vision and super sight or enhanced vision.

2. Does she live in a world of moth people or various animal like characters? 

The insect realm she lives in has a multiplicity of kingdoms and people. There are the spiders, ants, bees, wasp, hornets, and other insect humanoid creatures.