Understanding and predicting particle-fluid interactions in sedimenting suspensions is essential for advancing multiphase flow technologies used in chemical, environmental, and energy systems. In this study, direct numerical simulations with Smooth Profile Method was employed to investigate the settling dynamics of bidisperse spherical, non spherical particles particles. The spherical system was examined at an overall solid volume fraction of ??t = 0.1, where the concentration of large particles (?l = 0.001-0.5) was varied. The non-spherical system, composed of rod- and disk-shaped particles constructed from chained spheres, was analyzed at a fixed solid fraction of ??t = 0.07 with disk volume fraction ?d = 0.00-0.07. The simulation results reveal pronounced microstructural transitions driven by bidispersity. In spherical suspensions, the first peak of the radial distribution function (RDF) weakens while a secondary peak emerges as ?l increases which indicates the clustering of small spheres around large spheres. In rod-disk suspensions, increasing disk content suppresses the first two RDF peaks and leads to the formation of a tertiary peak associated with disk clustering and rod alignment disruption. Despite these structural differences, both systems exhibit consistent macroscopic trends, the mean settling velocity rises and drag decreases with higher proportions of large spheres or disks. Temporal autocorrelations also evolve, showing monotonic strengthening in spherical suspensions, whereas in rod-disk systems they first intensify (up to ?d = 0.035) and then diminish. Overall, this combined study provides a comprehensive understanding of how size and shape-induced bidispersity governs microstructural evolution, hydrodynamic interactions, and settling dynamics.