Lulucy Ru (ルールーシー=ルー) - Farming Life in Another World (異世界のんびり農家)

A magic-using female vampire who has an interest in growing medicinal plants. Her size changes with her magic power reserves (which she can recharge by drinking blood); though she willingly stays a loli to deter her husband's massive libido. Ru loves Hiraku's blood, which is premium due to his blessed healthy body. The "Vampire Princess," as she is also known, is Hiraku's first wife and the mother of their son Alfred.