  We formulate minimal SuperGeometric Quantum Field Theories (SG-QFTs) that
allow for scalar-fermion field transformations in a manifestly
reparameterisation covariant manner. First, we discuss the issue of uniqueness
in defining the field-space supermetric of the underlying supermanifold, and
clarify the fact that different supermetric definitions can lead to distinct
theories in the off-shell kinematic region. By adopting natural choices for the
field-space supermetric, we~then show that scalar fields alone cannot induce a
non-trivial field-space Riemannian curvature in the fermionic sector, beyond
the one originating from the scalar part of the theory. We~present for the
first time minimal SG-QFT models that feature non-zero fermionic curvature both
in two and four spacetime dimensions. Physical applications of SG-QFTs are
discussed.
