Because it was the only way to save the galaxy. Cosmo also wanted to find her destiny and finally found it.
Cosmo has a sister in sonic x called galaxena
# Does Cosmo return to sonic x in season 4 or 5
No! Shut up man cosmo died because she saved the world in sonic x! Your a stupid idiot.
yes. in a Japanese version of an sonic x episode where cosmo dies tails told her he loved her
Cosmo is a plant-like creature known as a Seedrian.
As some people know, in "the Cosmo conspiracy" episode, Tails had to kill her to save the galaxy. This was clearly hard for Tails, because he had grown feelings for Cosmo. In the Japanese version of Sonic x, Tails had shouted, 'I love you' before he shot Cosmo. And in the end she also said, 'I'll love you forever'. In the next episode, Sonic looked for Cosmo, but found only a seed, which he gave to Tails.
Galaxina
Cosmo
In the Television Series Sonic X, Yes, Tails does kill Cosmo. However, she voluntarily gave up her life so it is not murder. He didn't want to because he loved her very much it was a heartbreaking episode :'(It was cosmo's destiny apparently
No, she only appears in Sonic X
Cosmo died because Tails had to kill her with a cannon he had no choice =[ however, in the Japaneese, when sonic returns to the tyfoone and gives the seed to Tails, Tails says "It´s not true. Just a second ago this was Cosmo" so if you are going acording to the japaneese version she was turned into that seed
In sonic x they hold hands