Another one - The Uncle books, by J P Martin: Long ago, a small boy got some wonderful books from the local library. Peopled by strange characters like the benevolent elephant Uncle, his nemesis Beaver Hateman, Uncle's companion The Old Monkey, the skewer-throwing Hitmouse and the ingenious American Ira Smoothy, and set in twin strongholds, sumptuous Homeward and squalid Badfort, how could a little kid not be left with a sense of wonder?
Years passed, but the characters remained, reinforced by memories of Quentin Blake's great illustrations. The books are were long out of print, but I'm trying to compile some information to help people find them.