Other known Taurus
Katsuki Bakugo - My Hero Academia
Lucina - Fire Emblem
Mikoto Misaka - A Certain Scientific Railgun
The Nakano Sisters - The Quintessential Quintuplets
Ayame Shaga - Ben-To
Tifa Lockhart - Final Fantasy VII
Lettuce Midorikawa - Tokyo Mew Mew
Conan Edogawa - Detective Conan
Miaka Yuuki - Fushigi Yuugi
Kyoujurou Rengoku - Demon Slayer
Asuka Tenjouin - Yu-Gi-Oh GX
Moka Akashiya - Rosario + Vampire
Takumi Usui - Maid-Sama
Aoi Kunieda - Beelzebub
Special Week - Uma Musume Pretty Derby
Asia Argento - High School DXD
Cagalli Yula Athha - Gundam Seed
Caesar Anthonio Zeppeli - Jojo's Bizarre Adventure
Gon Freecss - Hunter x Hunter
Asuna Kagurazaka - Negima

From my research, what Taurus are known for are being enchanted by any physical manifestation of comfort and luxury, while many examples barely scratch the surface of these traits, Diana on the other hand is an Ojou-Sama, who better to represent Taurus than the pride driven top student of Little Witch Academia.
Far from being a rich bitch, most of her confidence is driven by her heritage and frustration of seeing others fail, she also admits her faults, and selflessly puts herself forward in pursuit of success, another known trait of a Taurus is that they're ambitious, focused, resilient and not afraid of hard work.
You definitely can't call Diana lazy.