Not sure if its considered a kusamono ?

A kusavolcamono maybe?...

I think many of us, including myself, tend to use the term "kusamono" for accent plants, the ones that are associated with a bonsai in a presentation. I've just checked, and it seems the word "shitakusa" is the right term.

In my opinion, any plant in any pot that can match a tree regarding shape, colour and movement can be considered as a shitakusa.

From what I've just read, kusamono are plants that are displayed individually for their interest and their beauty.

So yes, this can be a kusamono.

What is the plant?

I'd let it grow a bit bigger because, like Alain suggets, it has that exploding volcano look about it which would be enhanced if it were a bit larger.

I like it!

i think its a weed lol, i found it growing beside one of my bonsai after a few wks, din really notice it as it was growing shrubb'ly covered mostly by the bonsai foliage. So took the trouble to undig it out carefully, thought it has the nice small leaflets which has good proportions with comparison to its overall size.

AlainK wrote:
From what I've just read, kusamono are plants that are displayed individually for their interest and their beauty.

A kusamono is not a single plant. A kusamono is a dish-garden arrangement of herbaceous plants, flowering or foliage, maybe including a tree seedling. A kusamono may be displayed like a bonsai.
In the old days, in Japan, bonsai was strictly reserved for men. Ladies who were similarly inclined did kusamono or ikebana.
The little plant looks like what we call artillery plant, Pilea microphylla. It is often found growing in pots with tropical bonsai or house plants. It is considered harmless.
The pot shaped like a tree stump is a bit distracting to be used for a bonsai accent plant. A shitakusa is used to complement or set off a bonsai, & should not compete with it.
Iris