Gemini

It may only show one but there are two of these little spirits, These are Gemini or Gemi and Mini from Fairy Tail, The one in the picture is Mini and Gemi has a upside v for a mouth, they use Transformation and Copy Magic, You can guess what transformation does but copy also lets them turn into someone they touch but also gain all the memories and magic of the person, Depending on the Mage they're contracted with, they undergo personality changes to reflect said Mage's personality. You are a Celestial Spirit Mage and the Heartfillia bloodline doesn’t exist here