individual, counter for articles
個 centers on a single, separate unit: an individual person or thing, and by extension a counter for articles or items.
個 combines 亻 (person) with 固, which likely contributes the sound and the idea of something solid or fixed, suggesting a distinct individual entity.
A person 亻 standing beside something solid and fixed 固: each person is an individual, and each solid thing can be counted as one article.
For コ, imagine counting individual items by saying 'co-co-co' like a gentle knock on each one: co -> コ, and each knock marks one individual article.
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individual; private person; personal; private
counter for (small) things or pieces
individual; separate; personal; case-by-case
individuality; personality; quirk; idiosyncrasy; character; individual characteristic
individual; specimen
single (room); room for one; one's own room; private room; private compartment
individual; one by one; separate; each
solo exhibition; one-man exhibition; one-woman exhibition
number of articles; number of items; quantity
each individual; each person
another; different; separate; discrete
several (objects, usu. from two to six)
private person; individual
every one; each
multitude
individual technique (in team sports); individual skills; individual play
combining the working parts of two or more broken machines to make one functioning machine
one (thing); one piece; one item
each; per piece
one-by-one; individual