This monster is based on a Baluchitherium, a prehistoric relative to the modern horses and rhinoceros. Its English name is derived from Deinotherium, which is also a prehistoric mammal, related to modern elephants.
Oddly enough, despite this monster's title as "swift hippo", neither of these prehistoric mammals are related to the modern hippos.
The cape and glasses worn by this monster are most likely a reference to Kamina, a character of the anime "Tengen Toppa Gurren-Lagann".
This card's artwork is taken from Yu-Gi-Oh! ZEXAL Rank 31: "Save Your Friends!!", specifically from the panel showing this monster being Special Summoned. However, its right arm is visible in its card artwork in contrast to that manga appearance.