While later games would expand the roster significantly, the PSP original focuses exclusively on the team: Asuka, Ikaruga, Katsuragi, Yagyū, and Hibari.
A review of on the PSP requires immediate clarification: there is no official mainline Senran Kagura senran kagura psp iso exclusive
Part of the charm (and the exclusivity) of the PSP ISOs lies in how the developers worked around hardware limitations. The "Clothes Ripping" mechanic—a series staple—was much cruder on the PSP. The models were lower poly, and the physics were jittery, yet this gave the game a certain raw, indie charm that was lost as the budget increased for console releases. The soundtrack, composed by the legendary Akihi Motoyama, also features slightly different mixes in the PSP ISOs compared to later soundtrack releases. While later games would expand the roster significantly,