Antonyms of native :
adopted, adoptive, foreign, nonnative, adventive, strange, impure, naturalized, alien, exotic, tramontane, established, foreign-born, unnaturalised, unnaturalized, imported, accidental, extrinsic, outward, superficial, supplemental, casual, fortuitous, subsidiary, superfluous, transient, external, incidental, superadded, superimposed, unconnected, introduced, transplanted, expatriate, immigrant, nonindigenous, filtered, pure, purified, dressed, processed, refined, treated, coincidental, acquired, adscititious, surface, exterior, adventitious, extraneous.
Examples of usage:
Dorn was a native of Washington. "The Desert of Wheat", Zane Grey.
You speak the best English I've heard from a native. "The Magnetic North", Elizabeth Robins (C. E. Raimond).
Such a native man is pointed out to you as an excellent Spaniol. "Northern California, Oregon, and the Sandwich Islands", Charles Nordhoff.