Hello everyone.

I'm currently about to start a project called Super Smash Brothers Brawl Version 2.
I would like to apply modifications in order to change the characters, levels and sound effects.
I may also attempt to increase the number of players per game for even more frantic action if possible.
There was no full guide online so I took it upon myself to create one.

Lets keep it simple and try adjusting the characters first.
Before I jump into the thick of it, is it at all possible to "add in new characters" rather than replace the current ones. I have seen several mod videos on youtube where individuals have managed to expand the list of fighters rather than replace.
Last time I could only replace them using the "wii scrubber" program.
If so could I please have guidance on how to do this.

If not, I'd like to replace the characters with the following.

1. Diddy Kong - REPLACE - Shadow the Hedgehog
2. Ike - REPLACE - Silver the Hedgehog
3. King Dedede - REPLACE - King K.Rool
4. Lucario - REPLACE - Mewtwo Skin
5. Lucas - REPLACE - Kid Goku
6. Meta Knight - REPLACE - Tails the fox.
7. Pikmin & Olimar, REPLACE - Bomberman
8. Pit - REPLACE - MegaMan
9. Pokemon Trainer - REPLACE - Yugi
10. R.O.B - REPLACE - Ancient Minister
11. Solid Snake - REPLACE - Masterchief Skin
12. Sonic the Hedgehog - REPLACE - Metal Sonic
13. Wario - REPLACE - Wario N64 (Mario Party)
14. Wolf - REPLACE - Venom
15. Bowser - REPLACE - Supa Koopa Mod
16. Captain Falcon - REPLACE - Captain America
17. Donkey Kong - REPLACE - Pacman
18. Falco Lombardi - REPLACE - Daffy Duck skin & sounds
19. Fox McCloud - REPLACE - Krystal the fox
20. Ganondorf - REPLACE - Ganondorf Melee version skin & sounds effects.
21. Ice Climbers - REPLACE - Baby Mario & Luigi
22. Jigglypuff - REPLACE - 343 GuiltySpark
23. Kirby - REPLACE - Slime Recolours
24. Link - REPLACE - Fierce Deity Link
25. Luigi - REPLACE - Rayman
26. Mario - REPLACE - Dr. Mario
27. Marth - REPLACE - Roy
28. Mr. Game & Watch - REPLACE - Paper Mario
29. Ness - REPLACE - Slippy Toad
30. Pikachu - REPLACE - Knuckles
31. Princess Peach -REPLACE - Rosalina
32. Princess Zelda - REPLACE - Zeldora (Majoras Mask)
33. Samus Aran - REPLACE - Iron Man
34. Toon Link - REPLACE - SkullKid
35. Yoshi - REPLACE - DryBones

I've searched through the online database and know the the above mods can work.
I just need advice on how to achieve this.