Here's my deck:

Player: Riku lv3

Friends:

Abu lv0 x1

Tidus lv0 x3

Mayor lv0 x2

Pinocchio lv1 x2

Hercules lv1 x1

Beast lv1 x1

Jack lv1 x1

Donald lv1 x1

Tigger lv1 x1

Fairy Godmother lv2 x1

Aladdin lv2 x1

Jack lv2 x1

Hercules lv2 x1

Beast lv2 x1

Jack lv3 x2

Beast lv3 x1

Leon lv4 x1

Magic friends:

Tink lv1 x1

Bambi lv3 x3

Simba lv1 x1

Simba lv3 x2

Attack:

Oblivion x1

Soul Eater x3

Oathkeeper x2

Dark:

Invisible x3

Behemoth x3

Aquatank x2

Parasite Cage x3

World:

Destiny Islands x3

Oathkeeper is great if you're planning to world race but with only 3x level 1 World cards your opponent might not even give you the chance to use it for the +1 HP advantage. I mean he might not even have any level 3 Dark Cards in his deck. Some think it's wiser to focus on puting only high-level dark cards in their deck because lower levels tend to be useless after the WR gains enough momentum through friends or what have you.

In short, since this isn't a world-racer deck, I wouldn't suggest using Oathkeeper. Putting in Divine Rose or Lady Luck might be better if you only want to use 2 attack cards of the same type. Otherwise, Oblivion and Soul Eater are nice choices for a Riku Aggro deck so no complaints there.

You've got too many Dark Cards as well. If you go against an Aggro Deck, chances are they might not even HAVE a world card for you to even play those on. If they do, it'll be a level 1 card for some special benefit that it provides. Level 2 and 3 world cards tend not to have any desirable effects. Well, except for Deep Jungle. But then if they're playing Deep Jungle you might want a card like White Mushroom instead.

Also, you might want to avoid having several Friend Cards that share the same name. I'd suggest leavling level 3 Beast in there but getting rid of the other beasts and trading them for cards with different names but the same level. For example, if you draw cards for your turn and you pull up 2 Beasts and 2 Jacks, then that's a far weaker hand than if you drew a Level 2 Goofy, a level 3 Beast, a level 2 Donald Duck, and a level 3 Jack. Your Friend cards will never be a dead draw so long as you never have 2 of the same name. Or if you draw a level 1 Jack while your level 3 Jack is already in the field, well, that's a wasted card as well.

But even then, if you're trying to use a Beast/Jack combo or a Beast/Herc combo as an Aggro deck... don't. You don't really need to get rid of Heartless Cards unless you intend to World Race. It's not like they can parasite cage you with only 3 level 1 World Cards. Don't get me wrong, Beast level 3 has a nice support value, and Jack is okay too, especially for casting. But you wont get much from having that combo aside from that support value, so I'd suggest to focus on them less.

Since Magic/Friends don't stick around for more than one turn, you don't have to worry about having more than 1 copy of them since you can pretty much use them the exact same turn that they come up. Having 3x Bambis is a nice idea.

Parasite Cages are alright, but since you're not running a Dark Deck (And I don't suggest that you do) they'll be vulnerable to attack from your opponent. Therefore, agaisnt a particularly annoying Friend card, they are a temporary solution at best.

However, I would suggest putting a Darkside in your deck or 3. The reason for this is: If you're going to rely upon Magic/Friends, then any player using Owl will be able to put a stop to your Bambi or Simba casting. You don't really want that to happen, so put Darkside in your deck and you'll be able to blow all of those support cards away real easy like.

I guess that was long but just some things I thought I'd point out.

Yeah, I didn't read any of that...but I did change the deck

Player: Riku 3

Friends:
Tidus x3
King
Mayor x2
Pinocchio x3
Phil x2
Herc lv1
Beast lv1
Jack lv1
Jack lv2
Aladdin lv2
Fairy Godmother
Hercules lv2
Beast lv2
Jack lv3 x2
Beast lv3
Leon
Cloud (Only using till I get a Seph...it is still a +9 afterall..jeez)

Magic Friends:
Bambi lv3 x3
Simba lv1
Simba lv3 x2

Attack:
Soul Eater x3
Oblivion
Ultima Weapon

Dark:
Invisible x2
Behemoth x3
Parasite Cage x3
Captain Hook

World:
Destiny Islands x3
Monstro lv1

Thats looking really good sir. Your definitely shattering the main ideas a lot of people have...me included...everyone's been afraid of running heavy Magic Friends but you laugh at them and it works.

Why not just use the Cloud as a Sephy proxy? Not like your going to be playing a lot of people in person...mainly just me and I don't care, I'm proxying a second Sephy, lol.