is it real to choose variants on the product lisitng page?

Hi,

The dynamic system which swaps the details of the product based on the selected variant can only work on the product page. having it on the listing will require a complete overwrite of the system (we actually plan on working on that this year or next).
So on a listing, you can have the characteristic dropdowns.
Now, if you just want a dropdown selector for the products on the listings, you can instead create a custom field of the table "item" and of the type "dropdown". Custom item fields can display on the listings. However, they can't change the price of the product, or have a stock management per variant, etc, so it might not suit your needs in that regard.