If you liked the FLCL anime, the Anime-Planet community thinks you'd like:
The 'girl in the sky' is a legend passed down through the ranks of one special family. Armed with the magical puppet skills he learned from his mother, Yukito Kunisaki follows in her footsteps, traveling from place to place, ever searching for that girl in the sky, ever chasing after that legend. His journeys have led him to a small costal town where he meets a girl that has a peculiar interest in him - could she be the one? As events slowly start to unfold in front of his very eyes, Yukito finds himself amidst a story that spans a thousand summers...
What if roller skates had high power engines that enabled the skaters to do stunning new tricks that defy gravity? What if you saw a beautiful girl effortlessly glide through the air with them? To Ikki, this is reason enough to secretly borrow a pair of Air Treck skates, and step into an underground world filled with gang fights and strange customs. Enamored with high-flying stunts and the flirtatious Simca, Ikki forms an Air Treck gang of his own and starts a life of fighting rival gangs and flying over the rooftops, chasing the girl always one kick ahead of him.
Well, both anime are how to say this ... "jakass"? yes that's a good word. In terms of plot they aren't similiar almost at all, the thing that connects them is extramely good action, quite a bit of Ecchi and upredictability of main characters. Even now I have problems with understanding why the main character of AG got naked on the construction site. And some actions taken in FLCL will be a mystery for many years to come. To sum up, both anime are a good watch especially unpredictability of the main characters helps them to stand out from other anime.
Four touching and intriguing stories are set to a backdrop of different songs: a futuristic cop patrols the streets to fight against crime; a girl experiences an out-of-this-world vision of the world after ingesting a variety of pills; a badass battling chick fights her way to happiness and manages to stoke the flame of love; and two lovers meet and exchange a beautiful rose.
Both FLCL and Amazing Nuts! feature incredibly stylish animation, plenty of inspiredly crazy humour, and a popular music soundtrack. Both are also very short. Amazing Nuts! is a series of shorts, and 'Kung Fu Love' is one particularly recommended for FLCL fans - likewise, fans of that short should check out FLCL if they have not done so already.
Witness the true beginning of the Matrix: how men created the machines and how those machines stood up against their masters, and the effects of the great war that waged between them, which in the end led to the fall of mankind. Watch the ship Osiris and its efforts to warn the remaining humans of the imminent attack; follow a champion who happens to break free from the Matrix; explore the exploitation of a glitch in the overall system; observe the story of the Kid and how he was found by Neo; travel with an investigator who tracks the well-known hacker Trinity; and learn the secrets of the Matrix in other wondrous ways.
FLCL and Animatrix adjoin insanity and atmosphere of rational lunacy. It's especially noticeable in the Beyond and Matriculated episodes of Animatrix. The Matrix and the flat-iron shaped factory give us a sense that something bigger that exists behind the scenes.
It's the 1930s, and Mafia groups fight for supremacy in American cities. Young Firo joins the secretive Camorra group; a meek street boy, Jacuzzi, finds himself the leader of a gang of thugs; an alchemist is producing a liquor of immortality, and a homunculus tries to retrieve it; and upbeat thieves Isaac and Miria head to New York after failing to strike gold in California. They ride the novel train, the Flying Pussyfoot, across the continent. However they find themselves embroiled in a ruckus caused by gangs, terrorists, serial killers, and others as multiple stories intertwine and unfold on this fateful ride. All are haunted and hunted by the legendary Rail Tracer...
Both these animes revolve around a seemingly incomprehensible sci-fi/fantasy plot and most of the characters are at least a little crazy. Baccano! has a bit more of a cohesive plot, but it's nonchronological so it gives off a similar feel to the random plot of FLCL. If you enjoyed one you will enjoy the other.