  Monolayer NbSe$_2$ is a nodal topological Ising superconductor at magnetic
in-plane fields exceeding the Pauli limit, with nodal points strictly on high
symmetry lines in the Brillouin zone. Here, we use a combined numerical and
group-theoretical approach in real-space to characterize the unconventional
superconducting state in monolayer transition metal dichalcogenides. Even with
a conventional pairing interaction, the superconducting state is intrinsically
parity-mixed and robust against on-site disorder. The interplay between the
Zeeman magnetic field, strong spin-orbit interaction, and electronic orbital
content confer the unique superconducting and topological properties. The
discussion also extends to strongly hole-doped MoS$_2$ and its relatives.
