Haw. Rev. Stat. § 554B-8: General powers of custodial trustee.

(a) A custodial trustee, acting in a fiduciary capacity, has all the rights, powers, and authority over custodial trust property that an unmarried adult owner has over individually owned property, but a custodial trustee may exercise those rights, powers, and authority in a fiduciary capacity only.

(b) This section does not relieve a custodial trustee from liability for breach of section 554B-7.