1. Negro is an outdated racist term. So one would question your agenda.
2. Tuaregs are primarily a diverse Berber group but are also intermediate between Sahelian Africans. No they wouldn't be intermediate with West Africans like Akans and definitely not Bantu people who live further South; both groups they never had contact with. The West African groups they would be intermediate with would be Mandes(in upper West Africa), Fulanis and other neighboring native Africans in the Sahel.
3. Though like I said Tuaregs are a diverse group and are not homogenous at all. So it depend on the location. Some cluster closer to what you call "negro" Africans, while some cluster more with other Berbers. IIRC Tuaregs from Niger cluster more with "Sub Saharan Africans".
Of course "negro" and "sub sahara" are useless and non-tangible words when having a discussion about African genetics and diversity.
4. You need to clarify; are we talking Y-DNA or mtDNA? Because IIRC some Tuaregs do carry a significant amount of West African E1b1a on their paternal side,
but most carry the signature Berber marker E-M81 which has its roots in East Africa.