What influence do we have over races?

Small minds are easily influenced. Those with larger minds may require a little persuasion, but the power of a summoner has no difficulty with that.

The many species of the nine worlds populate the hospitable lands. Some construct towns to live in and harvest the land for food and resources towards their own survival and progression. Others choose to prey on those weaker and steal or abuse that which they can take. Generally, each species finds its own equilibrium with the environment and thrives in its own way.

Introducing a summoner into the situation quickly alters matters.

If you wish to assume control over a group of creatures, it is always easier to share a similar agenda. If you seek to create an empire, then most species will flock to your banner if you help their cause and provide award. Success in itself is often reward enough.

Conversely, if you seek to cruelly dominate lesser beings and bring war upon others, it is better to embrace a more bellicose (Orcs, Trolls) or easily-subdued (Gnomes, Man) species.

All creatures can be changed over time, both physically and psychologically. You can dominate and shape the minds of an entire culture if you so desire, but going 'against the grain' of their existing aspects can be a longer, harder project.