how are they classified?
They were not considered "Germani" by ancient Roman authors but they are classified as a Germanic people by modern scholars.
Vandals
As the Vandals eventually came to live outside of Germania, they were not considered "Germani" by ancient Roman authors. Neither other East Germanic-speaking groups such as the Goths, nor Norsemen (early Scandinavians), were counted among the "Germani" by the Romans.

Since the Vandals spoke a Germanic language and belonged to early Germanic culture, they are classified as a Germanic people by modern scholars.
which emperor loved greek culture and adopted the wearing of a beard UNANSWERABLE where did caligula reign/ Rome. during which time? AD 37 to 41. who was his predecessor? Tiberius. who plotted against him? Cassius Chaerea. whom did he marry? UNANSWERABLE did he take part in any battle? Yes, during his reign, the empire annexed the client kingdom of Mauretania as a province. where is this located? It stretched from central present-day Algeria westwards to the Atlantic, covering northern Morocco, and southward to the Atlas Mountains. when did the vandals capture this place? 420s where were these invaders from? Southern Poland.
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Vandals [SEP] Classification
As the Vandals eventually came to live outside of Germania, they were not considered "Germani" by ancient Roman authors. Neither other East Germanic-speaking groups such as the Goths, nor Norsemen (early Scandinavians), were counted among the "Germani" by the Romans. Since the Vandals spoke a Germanic language and belonged to early Germanic culture, they are classified as a Germanic people by modern scholars.