Depends what time it is. But up until about the Marcomannic wars or thereabouts the Marcomanni were part of the Suebi. The arminus vs Marbod struggle can be understood as the Cherusci and the Suebi fighting for preeminence amongst the German tribes (with some Suebi tribes choosing instead the call of Arminus while some Cherusci subtribes follow the Suebi), while the Quadi only became relevant fairly late. There are also the Goths and Cimbrii, which were powerful parts/tribes of the Suebi confederation. But it definately depends on when and in how much detail you wish to go.
Edited to add; there were enough warring tribes in Germania to fill out all faction slots should one wish to go in detail with them.
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