Which kingdoms succeeded the the Gupta Empire in the 6th century?

The Gupta Empire, by the own reckoning of the Bharatas ourselves, lasted well until the 8th Century- so the question itself is fallacious.

The primary loss in territories the Gupta did face during the 5th Century- if one is to discount the natural weakening of Imperial control over the Provinces in the wake of the Civil War and the prevalent climatic changes- were localized in moder-day NWFP, Assam, and Godavari Valley. All the States created thence, however, appear to have been second string powers at best or, in most cases, puppets of the major Gupta rivals such as the Vakataka of the Narmada Valley.

Neither did they present a united front to Gupta power at any point; as can be seen from the fact that both the Vishnukundina and the Ganga- nominally Vakataka agents- were more often engaged in personal glorification rather than cooperating against the Oriya Gupta vassals in the Mahanadi Valley; the campaigns of Emperors Harsha and Aditya in the 7th Century CE put an end to whatever pretensions of Imperial Power they might’ve had.

In some form or the other, the Gupta Empire persisted until the campaigns of the Kashmira Emperor Lalitaditya in the mid 8th Century CE.

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Comment:

Could you provide references for climate change and it’s specificity to NWFP, Brahmaputra and Godavari as you seem to say.

Also why not elsewhere?

Cat: 

1- I do not provide “references” as a rule.

2- The Climatic disasters of the 5th and 6th Centuries are a fairly well-known phenomena. Google the “Crisis of the Sixth Century”.

3- Unlike with the West or the Far East, the answers on history you read on Quora by Hindu NrX or Trads are not only, for all purposes, the cutting-edge Historical Research for India but also often proscribed by the established universities. As just one example- the theory of massive flooding having devastated most of the Sindhu-Gangetic valleys in the late 6th Century was initially just a theory by Rohit in the early 2010s by studying the Shastras. His predictions were confirmed in public only recently: Deluge drowned mighty Guptas: Study

4- The 5 “hot-spots” for 6th Century Gupta finds as per Sanjeev Kumar’s work appear to be Varanasi, Bareilly, Ujjain, Khulna, & Jalandhar. Especially the first 3. Even the extant literature on the period appears to completely ignore the NWFP, Godavari, Assam areas- and by the mid 7th Centuries, we find the Gupta Emperors often leading wars against the now independent States there. Thus, it is our proposition that these territories fell out of the ambit of the Gupta Emperors as well as the multiple feudal aspirants to the Control of the Continent by the late 6th Century. Attempts to conquer them were often made- but apart from a short period under Emperor Aditya, all these appear to have failed.