Wis. Stat. § 856.23: Persons who are disqualified.

(1) A person including the person named in the will to act as personal representative is not entitled to receive letters if the person is any of the following:

(a) Under 18 years of age.

(b) Of unsound mind.

(c) A corporation not authorized to act as a fiduciary in this state.

(d) A nonresident of this state who has not appointed a resident agent to accept service of process in all actions or proceedings with respect to the estate and filed the appointment with the court.

(e) A person whom the court considers unsuitable for good cause shown.

(2) Nonresidency may be a sufficient cause for nonappointment or removal of a person in the court’s discretion.