Lets say this is a given: someone I know is able to manifest small, organic, of-this-world, creatures when things get dire, or out of hand, or even excited (sometimes during hard concentration).

This person is interested in being able to control this manifestation through will, they have tried a sigil with no luck, and have memorized the creature's name in Latin, reciting that seems to narrow down the species when it happens but still has trouble doing it when they want it to. I don't expect a bunch of people to give useful information, or even believe me but my friend insisted I asked through here because I don't know any more advice I can give them. This person wants me to ask this question on my computer to keep things anonymous.