An Assist Trophy (アシストフィギュア) is an item in Super Smash Flash 2 that, when grabbed, summons a random non-playable character to aid the player who summoned it.
Assist Trophies work nearly identical to Poké Balls. However, no Pokémon come out of them, and once an Assist Trophy is grabbed, it is automatically activated, assuming the holder is standing on the ground, and not in a jump, attack or hitstun animation. Basically they are "guest" characters separate from the playable roster. The majority of Assist Trophies in SSF2 are undamageable, with only Metroid, Mother Brain and Starfy being able to be interrupted or otherwise hit.
List of characters released from Assist Trophies
These are the characters that can be summoned from Assist Trophies:
Lakitu soars in the air, moving back and forth, dropping Spiny Eggs onto the stage that hatch into Spinies, whom will start walking around, damaging any opponents they touch.
Metroid chases any opponent and upon catching one, it latches onto it, racking up the damage of the opponent. It can be attacked to prevent it from latching on someone.
Mother Brain stands in one place, summoning a swarm of Rinkas that damage opponents on contact. She laters shoots her powerful Laser Brain Attacks several times that deals heavy damage on opponents. Players may stand on her container.
Starman teleports around and shoots PSI moves, like PK Beam γ or PK Beam Ω, in various directions without moving. The lasers deal decent damage and knockback, and KO at very early percentages.
Starfy attacks by performing a series of spinning moves, ironically called "Star Spins", with short range that trap nearby opponents, with possibilities of dragging them off-screen, KO'ing them. He is weak and can be attacked, but is hard to defeat.
Proto Man rushes across a selected portion of the stage, where there are opponents near; he will then ram into them using his Proto Shield and fire at them with his arm cannon.
White Mage conjures one of several different white magic spells that will either directly aid the summoner or directly hinder the summoner's opponents.
Rukia Kuchiki initially stands in one place preparing her signature Some no mai, Tsukishiro, which delivers a single quick slash with her Zanpakutō that freezes opponents.
Unconfirmed Assist Trophy
This section contains information of a formerly confirmed feature.
The original source that confirmed the subject has otherwise become obsolete, outdated or deprecated and has yet to be reconfirmed by an official modern source.
Viewtiful Joe fights alongside the characters using a plethora of moves, including Mach Speed and Voomerangs. His fate as an Assist Trophy is still unknown.
Removed Assist Trophies
This section contains information pertaining to unused content.
The subject was never implemented or was removed, cut or altered at some point of its development, and this section pertains to its original implementation.
Bandana Dee charges at opponents and jumps around. Very weak and can be defeated with a few weak attacks. Changed into a playable character in Beta 1.0.
PAC-MAN follows directions from the summoner and chomps down opponents to send them flying with high knockback. Changed into a playable character in Beta 1.0.
Amigo plays Samba de Janeiro, which causes all grounded opponents except for the character who released him, to taunt uncontrollably until he leaves the screen. Removed for being increasily buggy in each update as well as being annoying to players.
Renji attacks with several combos while jumping and running around the stage, culminating with his strong Bankai: Hihiō Zabimaru. Removed due to collision bugs, as well as Rukia's larger importance in Bleach.
Light, with the help of Misa Amane, uses the Death Note to write the name of one of the opponents in order to KO them after a 10-second timer ends. Due to his cheap nature, Light Yagami is one of the rarest Assist Trophies to appear. He was removed for being too overpowered.
Due to complications with some bugs, the Assist Trophies, Poké Balls, Bumpers, and Explosive Tags were disabled on demo v0.9b but were added back in patch 0.9.1.1965, except for the latter.