Sure looks like Helleborus x hybridus:-)) If it were going to bloom this season, it would have done so by now. But sometimes seedling plants or those recently divided can take a couple of years before they produce flowers. Plant in well draining, organically rich soil in an area that receives several hours of morning shade or in a dappled shade location. And make sure it gets some water during dry periods. Hellebores bloom best when they receive several hours of sun and they dislike conditions that are excessively dry (but they don't like it very damp, either!).

Your mystery plant #3 could be Hosta undulata mediovariegata. Did you know there is a forum just for IDing plants? Your mystery #4 could probably be answered in a few minutes over there.

Here is a link that might be useful: Name That Plant!