Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in this Registration Statement on Form S-8 of CoastalSouth Bancshares, Inc. of our report dated March 12, 2026, relating to the consolidated financial statements of CoastalSouth Bancshares, Inc., appearing in the Annual Report on Form 10-K of CoastalSouth Bancshares, Inc. as of and for the year ended December 31, 2025.

/s/ Elliott Davis, LLC

Greenville, South Carolina

March 12, 2026