What superpartners are predicted for electrons and quarks by supersymmetry?

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What is string theory? — string theory Brian Greene explains the basic idea of string theory in under three minutes.

In the framework of supersymmetry, which is a key component of string theory, every known fermion is predicted to have a corresponding boson partner.

For the specific particles you mentioned, the predicted superpartners are:

Electrons: As leptons, electrons have supersymmetric partners known as sleptons.1
Quarks: These have supersymmetric partners known as squarks.21

These superpartners are required to have different spin values than their counterparts; while electrons and quarks are fermions with a spin of 1/2, their respective partners are bosons with integer spin. Although these particles are theoretically predicted to help resolve inconsistencies in the Standard Model, there has been no experimental evidence to date confirming their existence.21