Wis. Stat. § 786.08

(1) (a) When the application is made on behalf of a minor or incompetent, who has no general guardian, the court shall appoint some suitable person special guardian of the minor or incompetent in the proceeding; the special guardian shall give a bond to the judge of the court, to be filed with the clerk of the circuit court, in such sum, with such sureties, and in such form as the circuit court or judge directs, conditioned for the faithful performance of the trust reposed, for paying over, investing or accounting for all moneys that shall be received by the guardian, according to law and for observance of the directions of the court in relation to the trust. (b) When the minor shall have a general guardian, such general guardian may be appointed special guardian in said matter; or, such general guardian, as such, may be authorized and empowered to act in and conduct such proceedings in the same manner, and with the same provisions as to an additional general guardian's bond, as is provided in said proceedings for the conduct thereof by the general guardian of incompetent persons.

(2) When the application is made on behalf of an incompetent person, the guardian of the incompetent person shall, in the discretion of the court, give a bond to the judge of the court to be filed with the clerk of the circuit court, in such sum, additional to the guardian's original bond, as the court deems necessary, with such sureties and such conditions for the faithful performance of trust reposed as prescribed by this section.