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No-Hair Theorem

A black hole is completely characterized by only three properties: mass, electric charge, and angular momentum (spin), regardless of its initial complexity.
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The statement of the theorem

Consider the vacuum solution to the Einstein Field Equations (Rμν=0R_{\mu\nu} = 0) in the asymptotically flat limit. The theorem asserts that the metric tensor gμνg_{\mu\nu} is uniquely determined by the three conserved charges: the mass MM, the electric charge QQ, and the angular momentum JJ. The resulting metric is the Kerr-Newman solution, which is characterized by the parameters (M,Q,J)(M, Q, J) alone.
Source: Wikipedia