Ash's Serperior (Aura)

Ash's Snivy was the fourth Pokémon that Ash Calem Ketchum caught in the Unova region.

Personality and characteristics
Snivy is nothing less than a Pokémon shrouded in mystery. It is revealed that she had a previous Trainer whom she left because they did not meet her expectations, but she seems to have found what she had been searching for in Ash. It apeares that Snivy was looking for compassion and loyalty from a trainer, as it kept remembering Ash's multiple self sacrificial actions in which he prioritised his Pokémon's safety above his own. This may be the reason Snivy left her previous trainer, which shows that Snivy has little tolerance for selfishness and only respects those who treat her and her fellow Pokémon with respect. She tends to show no emotion except for when she is battling, even then moving as gracefully as she does outside of battle. Snivy is a fierce competitor and will take each battle that she participates in seriously. She is very mature psychologically, as seen when Ash's newly hatched Scraggy attempted to attack her and she did not utilize her full strength when stopping him. Though Snivy is distant, she still knows all of her Pokémon companions well and watches out for them whenever their Trainers cannot.

Behind her tough exterior, Snivy actually cares deeply about her friends, as shown when she comforted Tepig when he was disappointed by his former Trainer and was later seen hugging a newly evolved Pignite along with Ash while laughing, making it one of the few times she ever laughs.