It's difficult for me to tell from the pictures, but the first two pictures look like a hibiscus or rose of sharon type of shrub. Maybe wait and see if it flowers.
The third picture with the long leaves, and buds, is a Buddleia or butterfly bush. They will seed by birds, and can spread. It will get large, several feet high, so it might need to be moved away from the other plants if you want to keep it.
Thank you for contacting Cooperative Extension,