The measurement of neutral particle density and electron parameters is essential for understanding edge plasma behavior in magnetically confined fusion devices, particularly in the presence of resonant magnetic perturbations and strong plasma–wall interactions. In this work, we present the design and performance assessment of a multi-pass optical diagnostic system for the Tokamak à Chauffage Alfvén Brésilien tokamak, aimed at simultaneous measurements of neutral hydrogen density via laser-induced ionization and electron temperature and density via Thomson scattering (TS). For extended laser pulse durations, photon yields on the order of for H and for H are expected under saturated or near-saturated LII conditions. In parallel, simulations of the integrated multi-pass TS system predict an increase of nearly eight times in detectable scattered photons compared to the existing single-pass configuration.