Some of the cards have been made with YGO Card Maker. All cards are based on the anime Tengen Toppa Gurren Lagann.

Card format
Monster
(Set code)-EN(number)
Name
(Attribute)/(Type)/(Level)/(ATK)/(DEF)

TTGL-EN001
Lagann
Earth/Machine - Effect/3/800/800
During your Main Phase, you may pay 800 Life Points to equip 1 Machine-type monster on the field to this card. This card gains the ATK and effects of the equipped monster. (Only 1 monster can be equipped to this card at a time.) When this card is to be destroyed, destroy the monster equipped to it instead.
IMAGE: http://i27.photobucket.com/albums/c161/Los...lagann_card.jpg

TTGL-EN002
Gurren
Earh/Machine/4/1900/1000

TTGL-EN003
Gurren-Lagann
Earth/Machine - Fusion - Effect/6/2400/1800
[Gurren] + [Lagann]
This card can only be Fusion Summoned by sending the Fusion material monsters on your field to your deck. (The card "Polymerization" is not needed.) During your Main Phase, you may tribute 1 Machine-type monster on your field to increase this card's ATK by the ATK of the tributed monster. When this card is destroyed, Special Summon 1 [Lagann] in your Deck to your field.
IMAGE: http://i27.photobucket.com/albums/c161/Los...lagann_card.jpg

TTGL-EN004
Arc-Gurren
Earth/Machine - Effect/6/2400/1600
This card cannot be targeted by your opponent's Spell and Trap cards.

TTGL-EN005
Arc-Gurren-Lagann
Earth/Machine - Fusion - Effect/8/3200/2300
[Arc Gurren] + [Gurren-Lagann]
This card can only be Fusion Summoned by sending the Fusion material monsters on your field to your Graveyard. (The card "Polymerization" is not needed.) During your Main Phase, you may select 1 card from your opponent's hand. If the card is a monster card with a lower ATK than this card, remove it from play. When this card destroys an opponent's monster in battle, remove the destroyed monster from play. When this card is destroyed, Special Summon 1 [Gurren-Lagann] from your Graveyard to your field.
IMAGE: http://i27.photobucket.com/albums/c161/Los...lagann_card.jpg

TTGL-EN006
Chouginga Dai-Gurren
Earth/Machine - Effect/8/3000/2500
When this card is Summoned, add 4 [Shield Counter] to this card. When this card is to be destroyed, remove 1 [Shield Counter] instead.

TTGL-EN007
Chouginga Gurren-Lagann
Earth/Machine - Fusion - Effect/10/4000/3000
[Chouginga Dai-Gurren] + [Arc-Gurren-Lagann]
This card can only be Fusion Summoned by sending the Fusion material monsters on your field to your Graveyard. (The card "Polymerization" is not needed.) During your Main Phase, you may pay 1500 Life Points to make your opponent reveal their hand. Remove all effect monsters in their hand from play. You cannot attack during the turn this effect is used. During the Battle Phase, this card can attack all monsters on your opponent's field once. When this card is destroyed, Special Summon 1 [Arc-Gurren-Lagann] from your Graveyard to your field.
IMAGE: http://i27.photobucket.com/albums/c161/Los...lagann_card.jpg

TTGL-EN008
Tengen Toppa Gurren-Lagann
Earth/Machine - Fusion - Effect/12/5000/5000
[Chouginga Gurren-Lagann] + 4 Machine-type monsters
This card can only be Fusion Summoned by sending the Fusion material monsters from the field to the Graveyard. (The card "Polymerization" is not needed.) During your Main Phase, you may remove a Machine-type monster from the Graveyard. This card gains the ATK and effect of the removed monster until the next End Phase. When this card is destroyed, Special Summon 1 [Chouginga Gurren-Lagann] in your Graveyard to your field.
IMAGE: http://i27.photobucket.com/albums/c161/Los...lagann_card.jpg

Since I'm basing the cards off an anime, there are limits as to what kind of effects I can give them. As for being basic, it's not always a bad thing >_>.

As for being overpowered, that's how they were in the anime (I took care to not make them broken though). And besides, did you consider how difficult it is to summon some of the fusions (particularly the last 2)? So I felt like making them more powerful to justify summoning them in the first place. (particularly TTGL itself, which pretty much says "you win the game once you manage to summon it")