After service and return of process against a defendant under the age of eighteen years, the action shall not be further prosecuted, until a guardian for such defendant shall have been appointed, except as provided under RCW
7.105.100. Upon the request of such defendant, the justice shall appoint some person who shall consent thereto in writing, to be guardian of the defendant in defense of the action; and if the defendant shall not appear on the return day of the process, or if he or she neglect or refuse to nominate such guardian, the justice may, at the request of the plaintiff, appoint any discreet person as such guardian. The consent of the guardian or next friend shall be filed with the justice; and such guardian for the defendant shall not be liable for any costs in the action.