Here's how I visualize Toasty working.
When activated, Scorpion will exclaim,
"Come here!" (with the echo filter like other Final Smash voice clips) and send out two spears, as opposed to the single spear from his special attack so it's visually and audibly different. During this animation, Scorpion is invincible and cannot be hit. The spears travel a little farther than Simon's Forward Smash and grabs on contact should it connect with its target anywhere between its starting or ending point. Should the spears not connect with their target before reaching their maximum distance, they will fall limp and retract to Scorpion, after they fully retract, Scorpion will become vulnerable again.
Should the spears meet their target however, they will immediately grab that character and bring it to Scorpion. The spears act as a command grab and cannot be blocked, unlike the special attack version in which they can like in the arcade games. Also on contact, the screen will have a red fiery filter over it to make the background appear on fire. Once the target pulled to Scorpion, the screen will zoom in on them while the Fatality jingle (either
MK9 or
MKX would work) plays with the phrase "Finish Him!" (or "Her" or "It" depending on the character) is both displayed on the screen in the
classic MK text and
spoken by the MK announcer. The collected character will stand in front of Scorpion caught in the dazed/dizzy animation as Scorpion forcefully yanks his mask off, revealing the flaming skull. Scorpion then starts breathing fire downward at his target's feet which quickly begins rising until the target is completely obscured by the fire. The fire deals about 50% of damage before the Final Smash ends in one of two ways.
If the target's damage at the end of the Final Smash is at or above 100%, the character will immediately be despawned (with the despawn sparkles visible like other Final Smashes that instantly remove a character) and that player loses the stock. Scorpion then puts on his mask and holds his fist in the air triumphantly as the phase "Fatality!" is both displayed on the screen and spoken by the MK announcer. If that phrase is too "mature" for Smash Bros's rating, the phrase "Flawless Victory!" could be used instead. After that, the fire effects cease, the camera zooms back out and Scorpion returns to his idle animation, becomes vulnerable and the player regains control of hi.
However, if the target's damage is less than 100% by the end of the Final Smash, the target character will be launched forward at a 45 degree angle with about as much knockback as a semi-charged Smash Attack. As this happens, an
image of Dan Forden will pop in the lower right corner of the screen in front of everything (the same depth layer screen KOs would impact) as the phrase "Toasty!" is both displayed on screen and
spoken in his falsetto voice. He'd then immediately slide back of the right side of the screen, the fire effects would cease, the camera zoom out and Scoprion return to his standard playable operations.