Tubba Blubba

Tubba Blubba is a monstrous Clubba and follower of Bowser; despite chis fearsome appearance, Tubba Blubba is actually somewhat sensitive, and is also mentioned at being a coward.

In Paper Mario, it is mentioned by Lady Bow that Tubba Blubba was continually scared and bullied by the Boo inhabitants of Boo's Mansion and Gusty Gulch, who took great delight of scaring the timid Tubba Blubba. When Bowser obtained the Star Rod and imprisoned the Star Spirits, he made Tubba Blubba completely invulnerable, by removing his heart from his body, apparently leaving a crudely stitched patch where it once was.

Now incapable of being harmed and no longer frightened by Boos, Tubba Blubba went about taking his revenge on them for their years of torment against, steadily devouring all Boos he came across, ironically making the Boos scared of him. Several attempts were made by brave Boos to discover some way to pierce Tubba Blubba's seemingly unbreakable defenses; most often, these Boos never returned from Tubba Blubba's Castle, but the rare few that did escape and learned at least a partial amount of Tubba Blubba's secret weakness were often tracked by the ghost devourer and eaten before they could reveal to much. Tubba Blubba's habit of eating Boos and inability to be injured soon caused him to gain a sinister reputation, with even Bowser's own troops beginning to show fear of Tubba Blubba's might.

Charged with guarding the captured Star Spirit Skolar, Tubba Blubba failed in this duty, as, after some time of being confined by Tubba Blubba, Skolar managed to escape his keeper's castle; only to become lost in Forever Forest and captured by Boos. Lady Bow, wanting to rid her people of Tubba Blubba's menace, made a deal with Mario, in exchange for helping her find Tubba Blubba's weakness, she would give him the captive Skolar, a deal which Mario accepted.

After several close encounters with Tubba Blubba, both in Gusty Gulch and the being's own castle, Mario discovered Yakkey, a talking key in Tubba Blubba's bedroom. As Tubba Blubba slept nearby, Yakkey, not wanting to be taken by Mario to the Windy Mill, where Tubba Blubba's weakness lay, tried to wake his master, and succeeded. After destroying a large poprtion of his own castle, Tubba Blubba gave chase to Mario, who managed to escape his pursuer's fortress. As Mario rushed through Gusty Gulch to the Windy Mill, several Boos attempted to hold Tubba Blubba back to buy Mario some time.

After defeating Tubba Blubba's sentient and mobile heart, which controlled Tubba Blubba's body and was his one vulnerable part, in the bowels of the Windy Mill, Mario gave chase to the organ when it tried to flee from him. Before Mario could catch it, Tubba Blubba's Heart found it's body and allowed itself to be swallowed by it, making Tubba Blubba whole once more; ironically, after becoming whole again, Tubba Blubba became weaker and vulnerable, despite claiming to feel unstoppable.

Once defeated by Mario, Tubba Blubba, with tears in his eyes, will reveal he is actually quite sensitive and begin to beg for forgiveness, releasing all the Boos who he ate before running away, claiming he doesn't want to be invincible if he had to fight people like Mario.

Interestingly, during Paper Mario's ending parade, Tubba Blubba and the Boos seemed to have become friends, as three Boos are shown to give a joyous Tubba Blubba a ride through the air during the parade, as Tubba Blubba's Heart frantically chases after it's body.

By the time of Super Paper Mario, it appears that Tubba Blubba had begun a career in television, as he is mentioned as being the star of an anime based on him known as The Blubbening; which has had at least three seasons, involves a princess and robots, and also happens to be a favorite show of the nerdy chameleon Francis.

Trivia

 * It is never revealed as too whether Tubba Blubba's Heart had life all along, or whether it's living, sentient qualities were the result of exposure to the Star Rod.