Is this a friend?

I’m in year 3 of trying to make my yard a native plant garden and mini wildlife habitat. Recently, this little buddy has moved into a pile of branches in the corner of the yard. He’s smaller than he looks in the picture, in person he looks like he could fit in the palm of my hand.

I’m glad I’m creating places for creatures to burrow– that’s the goal, after all– but now I’m nervous that I’ll end up housing animals that are invasive or detrimental.

Can anyone identify him? And in general, should I be keeping an eye on what creatures show up in my garden and trying to keep particular visitors away, or is it futile to intervene? I’m clueless when it comes to fauna.

Idk if it’s relevant here, but I’m in the Pacific Northwest.