Super Parent v1.5.1 for Blender Free Download
Welcome into the world of Colored Wireframes in Solid Views
You can decide what color have your Super Parent and its wireframe is visible also in Solid views.
From version 4.0 of Blender you can get colored wireframes by default in view settings, but anyway I left this option in the add-on as it works bit differently and still can be usefull (fro example if you want to use colors only for individual objects)Additionaly this option is available for every Mesh and Empty Object in Scene so you can have colored chosen objects in Solid View: