The phrase 'is individuals' is grammatically correct, however it is not very usable in written English.
It is a very odd construction and can be confusing as it could be interpreted in several different ways. To make it more usable, it could be rewritten as 'are individuals' or 'consist of individuals' depending on the context. For example, "This committee is comprised of individuals with diverse skills and backgrounds."
Dictionary
is individuals
adjective
Relating to a single person or thing as opposed to more than one.
Exact(60)
For Feinstein, as for Benjamin, it is individuals who matter.
And more generally, it is individuals who make cultures and who break them.
It really is individuals playing the music they want to play.
Sometimes it is individuals who spot when something isn't right, she says.
"All they have is individuals such as the public advocate of the city of New York.
In short, while this conflict is undeniably a deadly struggle between cultures, it is individuals who will determine the outcome.
All promised to deliver TV the way people (that is, individuals) really want it.
Ultimately, it is individuals that pay tax, as consumers, wage-earners, savers and so forth.
"But it is not about the team; it is individuals first.
"What I see here is individuals trying to change the definition of a longstanding institution called marriage to fit into their agenda".
In America it is individuals, not governments, who have established public collections of art, books and manuscripts of dazzling quality, diversity and depth.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com