I recently thought of the idea of remkaing DBGT Final Bout, which came out for Playstation a while ago, and adding a of couple new things to it. This project is just wishful thinking until I fully learn C++ and other skills required for this undertaking. So since that was cleared up, I want to post some of the ideas I had to get feeback on some things I may need to make this project or if some of my ideas are just plain impossible.

Game: DragonballGT Online
Graphics: 2D (Similar DBZ games on the Super nintendo)
Players: 1
Other info: The game will play very similar to DGBT Final Bout but will be faster and with 2D graphics.

Challenge (Story)
Fight and defeat 6 original characters leading up to the boss Omega Shenron.
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World Tournament (Online)
Not necessarily a world tournament but two players simply get to battle each other using their enhanced characters from Build-Up mode (see below). Each battle won increases your power level while each battle lost does the opposite. Also, there two modes:

Competitive battle: (Your power level increases for each battle won and does the opposite for every battle lost)
Free battle: (Your power level can neither increase or decrease)

Note: What are "stats"/costs for implenting an online in a game?

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Build-Up Mode
Bring a character here to train in various activities that will increase his or her power level. These characters can then (only) be used in World Tournament to play other players online.
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Power level
Each character has a different, set power level. This would mean that a character may be faster, stronger, or have more energy than another character. To even this gap, players have the opportunity to train weaker characters and raise their power levels to be on par with stronger characters.

Orginal Characters
-These are the game's starting characters. Characters parethensis next to their name can transform and characters without are already transformed or do not have transformations.

Super Goku (Super Saiyan 3)
Super Vegeta (Super Saiyan 4)
Gohan
Piccolo
Frieza (Full Power)
Perfect Cell (Super Perfect)
Pan
Kid Buu
Super Saiyan Trunks
Super Vegito
Super Kid Goku (Super Saiyan 4[becomes an adult when transforming into this stage])
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Hidden characters
-Unlocked during Challenge

Uub - Beat story with Kid Buu
Super Saiyan Goten - Beat story with Trunks
Super 17 - Beat story with Cell
Omega Shenron - Beat story for the first time.
Bebi Vegeta - Beat story with Vegeta
Legendary Super Saiyan Broly - Beat story with Goku
Super Saiyan Gogeta (Super Saiyan 4) - Beat story with Kid Goku
Super Saiyan Gotenks (Super Saiyan 3) - Beat story with Goten
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What do you think? Can this be done? And even if it could, will it take so long that it probably won't even be worth doing? Thanks for your input!

1: if you want to learn to program, start with a realistic goal.
2: Take care not to get into conflict with the copyright holders of the content you are using.