I spent a long time deciding on this one and have never regretted the choice. It has nice 'visuals' and it's neutral and non-suggestive; aimed at being a 'meat-head deterrent'.
Here is my long list of nicknames I named myself. VampirePrincess/Snow Princess/SnowVamp/ SnowVamp666/SnowVampPrincess/WaterVampire/WaterVamp/ KelpieWaterHorse/KelpieHorse666/ WaterHorse/WaterHorse666/ WaterHorseSuccubus/WaterSuccubus/ WaterSuccubus666/SuccubusWitch/ SuccubusWitch666/SuccubusOnAHorse/ SexySuccubusLady/WaterHorseLady/ VampireLady/VampireLady666/ VampireDemonLady/WaterDemonHorse/DemonHorseLady/WaterPrincess/ ElementalHorse/ElementalWaterPrincess/ElementalVamp/ElementalVamp666/ ElementalSnow/SnowSuccubus/ StormHorse/ElectricalStormHorse/ ElectricStormHorse/StormSuccubus/ StormSuccubus666/StormPrincess/ StormPrincess666/SatanicVampireWitch/ SatanicHorseLady/SatanicSuccubus/ SatanicSuccubusWitch/DevilHorseWitch/DevilHorseWitch666/DevilSnow/ DevilSnow666/DevilHorsePrincess.