Biollante

Quotes
"Every rose has it's thorns. I think I may be more thorns then rose to be honest."

Back Story
Biollante is a Godzilla, rose, and human tribrid created by Genshiro Shiragami. Shiragami originally created a human-and-rose hybrid by splicing the DNA of his daughter, Erika Shiragami, who was killed in a Bio-Major-authorized bombing of his lab, with that of a rosebush. Then later, a volcano erupted, creating an earthquake that killed several roses, making Shiragami panic and splice the Godzilla DNA they had collected with a single rose so that it could become invincible. The fusion eventually led to the rose becoming sentient and able to move on its own, and it continued to evolve into a giant monster.

(I can't make this shit up, this is an almost direct copy of her backstory from the movie.)