#1 Can you post picture of growing plant? (I mean not just a plucked leaf)
#2 Probably Pilea pumila. picture of entire plant would help.
#3 Commelina communis.

The second one is definatly Commelina communis. Hugely invasive. They sell this plant at garden centers and I made the mistake of planting it. It seems to have jumped to other beds or ran undetected through the lawn to my other beds. It grows in the sidewalk and asphalt cracks. It is viney and just horrible. Try pulling it out of rose bushes. It seems to be easy to pull but you can pull it up in one place and it pops up elsewhere. Also if you pull it up and leave it on the ground it reroots itself readily. I learned that mistake and wasted a lot of time and back breaking work. This plant is as evil as Chameleon Plant and Purslane. Sure the true blue flowers are pretty and the trailing effect it has makes it seem perfect for planters but if you have cracks in you planters it will escape. It is known to be Round-Up (glycophosphate) resistant. Herbicides containing flumioxazin are recommended but have not helped me out one bit. Good luck.

I only found this flower in one of my shady beds and not very many at that. i will keep my eyes peeled for more and get rid of them as soon as I see them. They are so pretty though I could see why people would plant them.

Anita