What are the black minority groups in Ethiopia like genetically?

[Sikeliot]

I mean the people from the "Southern Nations, Nationalities, and People's Region" i.e. the region of Ethiopia where the truly black Ethiopians live rather than all the Arab mixed ones, who are sort of segregated and sectioned off from the rest of the country.

How would they come up genetically? Are they more related to West Africans and Bantus? Or are they an indigenous East African component as seen in South Sudanese for instance?

Many of them look very similar to black people in the West and in the Caribbean, US, Brazil, etc.

https://media.gettyimages.com/photos/ethiopia-southern-nations-nationalities-and-peoples-region-south-omo-picture-id528398456
http://c8.alamy.com/comp/EB6WET/dirashe-southern-nations-nationalities-and-peoples-region-snnpr-of-EB6WET.jpg
https://media-cdn.tripadvisor.com/media/photo-s/0a/31/d7/d7/mursi-people.jpg
http://c8.alamy.com/comp/EYFNGR/ethiopia-southern-nations-nationalities-and-peoples-region-south-omo-EYFNGR.jpg
https://media.gettyimages.com/photos/ethiopia-southern-nations-nationalities-and-peoples-region-south-omo-picture-id528398436?s=170667a
http://c8.alamy.com/comp/E58HDJ/the-bench-tribe-live-in-the-southern-nations-nationalities-and-peoples-E58HDJ.jpg
http://c8.alamy.com/comp/E58HD9/the-bench-tribe-live-in-the-southern-nations-nationalities-and-peoples-E58HD9.jpg
http://c8.alamy.com/comp/EYFNHH/ethiopia-southern-nations-nationalities-and-peoples-region-south-omo-EYFNHH.jpg
http://static.adweek.com/adweek.com-prod/wp-content/uploads/files/news_article/water-is-life-portraits-hed-2015.jpg
http://c8.alamy.com/comp/E58H8G/the-bench-tribe-live-in-the-southern-nations-nationalities-and-peoples-E58H8G.jpg