I'm lowkey glad niconicocho 2024 didn't have the usual vocaloid projection, if only to not have to watch the incredibly embarrassing way they make gakupo act all the time
Note gain: low to maintain a natural and subtle effect
Consonant rate: Increasing it can emphasize consonant sounds, which might be useful for creating the spitting effect
attack speed: consider a slightly faster attack to simulate the suddenness of the effect
Lower dynamics can make the spit sound softer and more delicate.
Increasing breathiness can add a soft quality to the voice. Experiment with this parameter to achieve the desired level of breathiness for your spit sound.
Phonemnes to use: さつっくぷ