Dennis "Denisovich" is the major character of Hotel Transylvania 2. He is the half-human/half-vampire son of Jonathan and Mavis. He is also the grandson of Dracula and Martha (his maternal grandparents) as well as Mike and Linda (his paternal grandparents). Through Mavis, Dennis is also the great-grandson of Vlad (his mother's paternal grandfather).
The Legend of Spike[]
Dennis as a bat