((This was my entry to a big collab that I can not seem to find. So here is my game idea))
There are two things I love a lot when it comes to Entertainment: Fighting and Crossovers. Nintendo had the idea of pitting 8 of their characters together for a mindless fighting game. What was originally supposed to be a one note Japan only game became one of their big titles. And since then, everyone tried to achieve that success.
Yet one company who has made numerous ideas that are similar to Nintendo's have yet to make their own clone of Smash Brothers. That company is Sega. I had this idea since I was a kid playing their Genesis and it continues evolving as I get older. And while Sega has released numerous crossovers under the Sega All Stars License, they have yet to make a Sega Fights (that’s my name for the idea. If they did this, they would probably call it Sonic and Sega All Stars Clash).
While the idea is Smash Brothers, I would go a different route for game play. Specifically, like Power Stone or Ehrgeiz: A 3D environment with free movement. You'll be able to pick up weapons and like Power Stone, if you collect 3 (this will be adjustable) emeralds, you'll be able to activate your All-Star Power. The goal will be to drain your opponents five (this will be adjustable) life bars before they drain yours. It'll be 1-4 players like Power Stone 2.
Unlike Power Stone, the All-Star Power will be divided into three categories:
Attack - When activated, you will be put in a cut scene similar to that of SF4 where you'll do a good amount of damage when it is complete. It'll be more damaging than the others, but it has to be connected in a close range. (Ex. Akira's will be a series of combos, possibly with an assist helping him)
Power - When activated, you will be able to move faster and do more damage. This will only last about 5-10 seconds (it'll depend on balance). If used properly, it could be the most damaging of the three. But it can be blocked and avoided still. (Ex. Sonic goes Super Sonic)
Game - When activated, everyone will compete in a mini game based off the game the character is from. To do more damage, you must successfully complete the mini game while your opponents fail to do so. If they can complete the mini game, they can reduce the damage from this (and not get knocked out if they are low on health). While this can hit everyone and can not be blocked, it is the weakest of the three All-Star Powers damage wise. (Ex. You must do one of Ulala's dance routines successfully)
Controls: (Using 360's Controller)
X: Attack | Pick Up/Throw Item (like a throwable box) | Pick Up/Use Weapon (like a Gun)
B: Attack | Smash/Kick Item (like throwable box) | Throw Current Weapon (like the Gun)
Y: Special Attacks (Can be used in three ways: Standing Still/Moving/Jumping)
L/RT: Rotate between opponents.
X+Y or B+Y: Grab | Activate All Star Power
You can make simple combos with pressing X or B repeatedly, or have a more complex combo mixing the two and finishing with Y (it'll be different per character).
Stages will be multiple layered and have numerous hazards. If you fall off the stage, you will return with reduced health (possibly 50% worth of a full bar).
I won't go into specifics because that could change anytime, I will go over how they would be selected.
Like Sonic Generations, 9 characters will be selected per era. 4 eras will be selected and they are: Genesis, Arcade, Dreamcast, and Modern. Of the 9: they will be three from the Sonic series (or Virtua Fighter in Arcade's Case), 4 of the more popular series and two from the more obscure ones. When you start the game, only 3 per Era (1 Sonic, 2 Popular) will be selectable from the start with the others needing to be unlocked.
Each System this will be released on (360/PS3/WiiU) will have three exclusive characters per system. If get permission, the three characters will be based off licenses associated with the System (Example: Sony will use Sly, Ratchet, and Jax). If not, then three characters who made their claim on said system (Example: Monster Hunter character on PS3).
There will be five bosses, one per Era and one exclusive for this game.
Modern: Egg Breaker from Shadow the Hedgehog. He'll fight similar to that game, except weapons will not be spammable and after five consecutive hits he will be dazed for an easy combo.
Dreamcast: Gouji Rokakku from Jet Set Radio. The arena will be set like the final boss of the game. You must destroy his capsule but he sends members of the Golden Rhinos to attack you. They have half a life bar worth of health each and can be targeted.
Arcade: Dual from Virtua Fighter. She can use moves from every selectable character (three random in total to reduce memory), including All-Star Power.
Genesis: Warhead from Vectorman. It starts off in a mini game where you are lifted via a tornado. You must avoid the stuff sent your way before facing Warhead. If you get hit, you lose health. When the mini game is over you'll be put on a roof with Warhead on the sides. After five consecutive hits he will be dazed for an easy combo.
There will be 4 stages per era with the bosses stages available when you beat them.
Story: (1 to 2 players)
Like the story mode in Mortal Kombat, this will be a series of fights that are connected via cut scenes. Unlike MK9, instead of forcing you to be one character, you can select any of the three starting characters in the Era the chapter is based on.
So there are 4 chapters per era, telling the story of that group's involvement with the story. In the 5th chapter, where the story concludes, you can select among all available fighters including the system exclusive ones.
If you pick 1 player, you fight in 1 on 1 battles. If you pick 2 players, you fight in 2 on 2 battles.
Arcade: (1 to 3 players)
Basically similar to the arcade mode in most other fighting games. Unlike other Arcade modes, you can select how you run the arcade. For example, you can do 1 on 1, 2 on 2, 1 on 1 on 1 or even 3 on 1. When in handicap matches, the stats on the 2 or 3 have their attack and health reduced by half.
Verses: (1 to 4 players)
Same as Verses in other fighting games. Like the Arcade, can select specific types of matches. You can also adjust how much health your character has and select any stage.
Survival: (1 to 4 players)
In Normal Survivor, it is the same as Survivals in other fighting games. You compete in a series of fights until you lose all your health. Like arcade, you can select specific types of matches. Each opponent will only have one health bar and will be replaced by a different fighter when their health is depleted.
In Player Survivor, one player is designated the Survivor while the other player(s) are designated as Challenger(s). The Challenger(s) goal is to defeat the Survivor as quick as they can. If the character they are loses, they get another character. When the Survivor is defeated, a new player is designated as the Survivor. After every player plays Survivor, the winner is the one who defeated the most Challengers.
Practice: (1 to 4 players)
Same as practice modes in other fighting games. Can practice in teams or solo. Also spawn any weapon available.
Online: (1 to 3 players)
All game modes above can be played online with a buddy or two sharing your game. You can also view replays people have uploaded or watch currently running games.
The only DLC I would wish is for balancing issues. But knowing Sega, they would try to include DLC characters and stages.
That's my dream game. As you can see, I left a lot of stuff out for the sake of freedom. I would be happy if Sega releases any sort of fighting crossover game but if its like this I would be in Heaven.