Not strictly bonsai with their roots in the ground but I saw one pruned as a shrub in a garden I visited and I'm trying to do that to mine. It was given to me years ago, already hacked about so no future as a tree. It's not very wonderful to look at so far.
some sort of amaranthus?
Rhus typhina, Stag's Horn Sumach.
might be Guitzotia abyssinica, nyjer, bird seed
Food plant of the Cinnabar Moth larvae.
A wild plant of the UK
I got 3 pods, then the plant died
I think those bright colours are for creators of outdoor rooms (or whatever the 'in' term is), not for serious gardeners. Nothing wrong with it if that's what you like.
worth looking at Decaisnea fargesii.
have you any photos showing the top side of the leaves?
They're very slow for the first few years so be patient