This study addresses the distributed consensus problem for uncertain high-order multiagent systems (MASs), ensuring fixed-time guaranteed performance within a directed graph. The key innovation of this design is the ability to preselect certain transient/steady-state metrics within a fixed timeframe. Moreover, a novel fixed-time prescribed performance function (FPPF) is formulated, eliminating the constraint of the initial error state value. Concurrently, the complexity of the controller design is mitigated through a variable separation technique. Lastly, a numerical simulation confirms the effectiveness of the proposed control algorithm.