In the present Letter we extend our previous studies on negatively charged fullerene clusters {C60C(COO-)(2)}(n), 2, and {C-60(C9H11O2)(COO-)}(n), 3, to a functionalized derivative which carries a positive charge {C-60(C4H10N+)}(n), 1b. It will be demonstrated that covalent introduction of a quartery ammonium group at the fullerene moiety, via N-methylation of 1a (N-methylfulleropyrrolidine C-60(C3H7N), not only enhances the water-solubility but the positive charge also enhances the rate of reduction of the fullerene core in a cluster to yield {(C-60(.-))(C4H10N+)}(n).