User blog comment:Littlegoodboy/Person to go along with dipper and mabel on there adventure/@comment-71.105.83.66-20121126012444

Any of them. and for these reasons:

1. Wendy- she is risky and adventurous and Dipper likes her

2. Soos- he notices the weird stuff and can help them easily

3. Stan- he might secretly know about these things