Oooh... I like the big Ethiopia!
For the Germans, Austria, Prussia, and the Hanseatic states (less so) establish posts in West and East Africa. When Greater German unification comes around, these posts are so concentrated that Greater Germany is able to negotiate holdings in these areas.
In Ethiopia, the Zemene Mesafint ends early, leading to expansion and the suppression of neighboring Muslim sultanates.
In southern Africa, the Boers and Zulu put even more of a fight (not a collaborative one!

), tying down resources. By the time it's over, the coast of Africa has been claimed by other nations, leaving the UK behind. But by expanding northwards, Britain can grab land no one else has claimed.
Kleber in Cairo (after Napoleon deserts his forces in Egypt) switches sides and pledges loyalty to the Bourbons. After the Napoleonic Wars, France gets a head start in Africa. After posts in Nigeria are established, a route from Lagos (or its ATL counterpart) to Cairo is found necessary, and France expands of the road.
Spain gets into conflict with Morroco, prehaps over piracy, and takes over the country by force. They expand from there.
Portugal decides to establish a cocao and palm colony on the Southwestern African coast. They expand up the Congo.
The Two Scilies and Sardinia compete for colonies in West Africa. After the Rigsormento, the two colonies are merged into Italian West Africa.