Make your own Assist Trophy.

G

Gumball Machine

Celestial Guide
Self-explanatory topic.

Just make your own Assist Trophy.

Anyway, some my ideas are;

Name: Roll.EXE
Series: Megaman Battle Network
Effect: Roll attacks whichever opponent is closest to her and deals a fair amount of damage, although the chances of scoring a KO are narrow. After attacking, she drops a heart on whoever summoned her, healing their damage percentage by 100.

Name: GutsMan.EXE
Series: Megaman Battle Network
Effect: GutsMan pounds the ground with his fists and anybody standing on the floor will take severe damage. The chances of a KO being scored are almost guaranteed. Although anybody not standing on the ground will be unaffected.

Name: Protoman.EXE
Series: Megaman Battle Network
Effect: Protoman will attack every opponent on screen with his sword and if multiple opponents are standing next to each other, they'll be attacked multiple times (i.e. if 2 characters are standing next to each other, Protoman will attack both characters twice). A heavy drawback though is that he can also attack whoever summoned him.

Name: Airship
Series: Super Mairo Bros.
Effect: An Airship will fly into the background and continuously shoot cannonballs, they deal a lot of damage, but are easy to avoid. Also, some green Koopa shells will fly across the stage horizontally.

Name: Chef Kawasaki
Series: Kirby
Effect: Chef Kawasaki will cook up some food and throw them all over the stage. They can be picked up by any character to restore their health.
 
Baby Mario and Baby Luigi use the Pocket Chomp, go back and forth in the stage. Either the Chain Chomp, Baby Mario's jumping, or Baby Luigi's Hammer will hurt opponents.
 
Me too, but if they're not, they should at least be Assist Trophies
 
Bowser Jr. paints the ground and slips opponents like Bananas.
 
Should he do damage?
 
Bowser Jr. will suck almost as much as Tingle using bananas then, except that it affects opponents. I think he should turn into Shadow Mario and attack people using the paintbrush.
 
Name: Kamek
Series: Mario/Yoshi
Effect: Kamek flies around the stage and can change the stage's terrain, or he can make all the characters either giant or small.
 
Kamek is an excellent idea.
A Pyro Guy or any other fire-type thing in any series lights half the stage on fire, dealing severe damage to anyone burned and destroying that part of the stage. Although, the part of the stage comes back after 30 seconds or so.
 
Name: Shadow Character
Series: SSB
Effect: It releases shadow bugs from SSBB which turns into a shadow clone of you, and attacks you.