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As a Caterpie, he has a very happy but shy attitude, shown to suffer from low self-esteem if he didn't make a good first impression. He was very hurt when Misty didn't take to him. He is also very brave, squaring up against a Pidgeotto and then both of Team Rocket's Pokémon single handedly.
As Metapod, he becoming very laidback, but remained extremely loyal to his trainer, jumping in front of a Beedrill to save him.
As Butterfree, his personality was similar to that of Caterpie, retaining his bravery and positive attitude, but as was seen in Bye-Bye Butterfree, his self esteem still suffered when he didn't make a good first impression.
Butterfree was caught as a Caterpie and evolved to a Metapod. Metapod then evolved when defending Ash from a flock of Beedrill. He caught it only by throwing out a Poké Ball. He once traded his Butterfree for a Raticate, but he missed his Butterfree so much, so he traded back. It seems to be a male Butterfree and was released to start a family with its mate, a pink Butterfree. Before winning the heart of its mate, Butterfree saved a bunch of wild Butterfree from Team Rocket (this caused the pink Butterfree to start having feelings for him).
|String Shot||Ash Catches a Pokémon|
|Tackle +||Ash Catches a Pokémon|
|Harden||Challenge of the Samurai|
|Sleep Powder +||Challenge of the Samurai|
|Whirlwind +||Clefairy and the Moon Stone|
|Stun Spore +||The Water Flowers of Cerulean City|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
Voice actress and actor
- Butterfree marked many firsts for Ash's Pokémon: It was the first Pokémon Ash captured, the first to evolve, the first to reach his final form, the first to be traded away (Ash still got him back), the first to have a confirmed gender, and the first to be released and the first dual type Pokémon Ash ever caught.
- As a Caterpie, Rikako Aikawa voiced it in both the Japanese and English versions of the anime. When it evolved into a Metapod, though, Aikawa continued voicing it in the Japanese series while Eric Stuart who played Brock in the original 4-Kids series voiced Metapod. Upon evolving into Butterfree, Aikawa began playing the role in both versions once again.
- Butterfree holds the record out of all of Ash's Pokémon for taking the shortest time to fully evolve, evolving from Metapod only one episode after it evolved from Caterpie. To compare, Ash's Charizard took three episodes to fully evolve, and his Goodra took four.