Series symbol

A series symbol is a distinctive iconography that represents an in-game universe in the  series and that is also present in Super Smash Flash 2. These symbols are assigned to playable characters, stages, and, to an extent, items. Within the game, the symbol can be seen next to a character's damage meter, taking on the same color of the player's number. It can also be seen behind the character's portrait on the character selection screen, next to the stage's name on the stage selection screen, in the background for personal Target Smash levels, and on the right side of unlock notices. Pages on the Smash Flash DOJO!!! also carry a symbol on the upper left corner of the update. Despite being a simplistic feature, there were no such symbols in the original Super Smash Flash.

List of series symbols
Below is a list that compiles and explains each symbol's source origin:

Minor symbols
There are no specific universes assigned to these symbols, but nonetheless, they receive a similar, yet brief, treatment as main symbols.

Former symbols
These symbols were present at some point before being discarded due to updated symbols.

Trivia

 * As a result of their early implementation into the  series before their eventual inclusion into the Super Smash Bros. series, FINAL FANTASY and Castlevania are currently the only universes to have visibly different symbols from the ones they have in the official titles (the series' initials "FF" and the silhouette of a bat and Dracula's Castle, respectively).
 * Likewise, Metal Gear was also given a new symbol in —an exclamation mark—replacing the old FOX Unit's insignia/Kojima Productions logo.
 * Any plans to update these symbols by developers (as was the case for Mega Man) are unknown.
 * The Bomberman and Rayman universes are the only ones to have had three symbols throughout SSF2 ' s development cycle.
 * Of the two, only Bomberman had its three symbols be virtually the same thing (a bomb) and all be released to the public.