Onar's ability Rush says "When you enter a space adjacent to a small figure, you may push that figure one space."

Can you push a figure when you enter their space?

No, as you are not adjacent to your own space.

Companions are, for most purposes figures, and they are adjacent to you while in the same space, however, Rush still shouldn't apply. Because talks of adjacent spaces and not adjacent figures, so while a companion might be adjacent to you, it is not in an adjacent space.

The space a figure is on is not adjacent to the figure, companions included.

A companion is adjacent to a figure or object in the same space, and a figure or object is adjacent to a companion in the same space, but not adjacent to its space.

The distinction between spaces and figures/objects is relevant.

Okay. That's what I thought. Thanks!