Top wo Nerae 2! Diebuster

Both can guarantee you astonishing mecha action. With very similar art styles, you can expect crazy fluid animation. Diebuster is much shorter than Tengen Toppa Gurren Lagann, but both are stories of epic proportions. 

Gurren Lagann and Top wo Nerae 2 were in essence tributes to the mecha genre as it progressed, blending classic over-the-top courage and passion with modern, realistic characters. If you liked either Diebuster or Gurren Lagann, you'll want the see the successor/predecessor for a lot of the same intense action, epic moments, and great characters. 

both are over the top crazy fun Mecha animes both animated by Gainex,Diebuster 2(AKA: Top wo Nerae!) is the sequel to the 80's classic Gunbuster(AKA: Top wo Nerae),however,unlike the first gunbuster anime which the animation and story style was similar to evangelion which a main female lead grew from a crybaby to a strong woman, the sequel Diebuster however,pays more homage to FLCL(Fooly Cooly) and is very similar to Gurren Lagann in style and humor,Nono(Diebuster),Nia(Gurren),and Yoko(Gurren) are very similar to some of the female cast in Fooly Cooly 

Gurren Lagann are inspired in Diebuster. Both are super robots animes produced by Gainax with epic moments. Story are alike, both deal with humanity trying survive against beasts/monsters. 

You can see clear similarities between the two series. You can see resemblance between the mech in Diebuster and those in TTGL; especially in the later parts of both series. Massive flashy fights and speeches are recurrent in both. Both series have themes about saving humanity. The whole feel of Diebuster reminded me of TTGL (and vice versa); HARD WORK AND GUTS! Both series have gone for the 'epic' route, and I must say they achieved them very well. Although TTGL is similar to Diebuster, that isn't to be said the same of Gunbuster. It is best if you also watch Gunbuster before Diebuster for absolute viewing pleasure though. However, Diebuster on it's own is still a very good series, and if you enjoyed TTGL, you'll definitely enjoy Diebuster! read more 

This 6 episode OVA contains many of the same themes that Tengen Toppa Gurren Lagann built and expanded upon. Like in TTGL, the mechs feature a very heavy fantasy feel vs. straight up science fiction, though not to the same extent. And it shares the same core message of reaching for the top and saving the universe by believing yourself. This was Nia's voice actor Yukari Fukui's first starring role, as one of the 2 protagonists, Nono.  

- Have the same goofy animation style. - Have the same dumb mecha designs. - Shounen willpower trumps all. - Completely devoid of any semblance of logic or rules. - Girls are there for T&A (lots of fanservice). - Nia (TTGL) is a clone of Nono (Diebuster). Diebuster is basically a pilot for TTGL. Their similarities in brainless style (and style over substance) and inability to take anything seriously is uncanny. 

Tengen Toppa Gurren Lagann could be a direct sequel to this that dates ten thousand or millions of years later after the events of Diebuster. Kamina's poses and speeches are eerily similar to the protagonist of this show. Diebuster gives us the origin of the anti-spirals. 

Both are over-the-top mecha similar art style Basically not matter how insane the enemy is you have be more badass then them!!! crazy fights and expect the unexpected XD  

Over-the-top extravagent Mecha action. Giant super robots, and a fight against a foe that isn't what it seems to be. Made by the same company, Gainax, and TTGL clearly takes a lot of influence from Diebuster and its predecessor, Gunbuster. 

Diebuster is essentially the prototype for the latter half of Gurren Lagann - Over the top space battles, massive destruction on a cosmic scale, robots that are bigger than can truly be comprehended, that sort of thing. 

Both anime have over-the-top fights, great animation, and are animated by the same studio. Gurren Lagann could be considered Diebuster's spiritual successor. However, I'd recommend watching Gunbuster prior to Diebuster in order to understand the plot better. 

Simply put, if Diebuster wasn't a thing, TTGL probably wouldn't be a thing. While not as straightforward and simple as TTGL, Diebuster can be refreshing in how much it challenges you to pay attention and rewards you with over the top planet splitting ridiculousness. It's a loose sequel to Gunbuster so watch that first but it isn't entirely necessary IMO. Both are underrated gems that Gainax has to offer.  

Over the top awesomeness is something these two shows share. Quite a few moments in both that make you say "hell yeah!" 

Diebuster is the very basis for TTGL. Featuring similar atmosphere and the predecessor of spiral power. If you love TTGL as I do, you'll adore Diebuster! 

Diebuster is quite literally the spiritual predecessor of Gurren Lagann especially in terms of its aesthetic and tendency towards fanservice. If you love Gurren Lagann and you haven't seen Diebuster, you are uncultured and I do not want to associate with you. I spit on you. Ptoo 

both are mecha manga with bad ass main character he looks very similar in their drawing and character, so much that we cannot deny the inspiration of Top wo Nerae 2! Diebuster when we see what the first series looks like Top wo Nerae we say 2 different series so much that tengen toppa gurren lagann has inspired Top wo Nerae 2! Diebuste this my opinion  

Same company, same epicness ! 

Mecha anime that have crazy battles with over the top attacks and get increasingly more crazy as the series progresses. They are mostly concerned with just being entertaining and not much else. 

Honestly I had a hard time thinking of an anime that was similar to FLCL, since it stands out from the pack so much. I didnt quite get the same feeling from watching FLCL as I do from watching Dead Leaves or TTGL as suggested by the top suggestions. I finally settled on Top wo Narae 2 being the closest to FLCL. It seems to have the same sort of crazy comedy and over the top action as FLCL. Even though they aren't quite the same, this was the closest I could 

Another 6 episode OVA by the same studio and director, which shows through very clearly in the animation style. The plot is more comprehensible but it follows FLCL's practice of showing first, and explaining later, so many things only make sense in hindsight. It's highly recommended to watch Gunbuster (Top wo Nerae!) first, as Diebuster builds off the plot of its predecessor. 

Diebuster is what you would get if FLCL had a baby with the original Gunbuster anime. Both have the same director and writer as well. 

Both works are directed by the at the time Gainax animator Kazuya Tsurumaki. Each show is characterized by kinetic action, narrative density, strong characters, and fluid animation. Both works are insane in a way that only a Tsurumaki work can be, though it should be noted diebuster has a much easier to follow narrative. 

About fighting giant monsters with mecha, heavily reference old Gainax shows, have a pink-haired female lead who isn't quite human, and end similarly. 

-Same mecha style -Same uniforms -Similar in the interaction between the characters -Colossolal fights -A beutiful Pink hair waifu that is not exactly human 

While probably not the most obvious recommendation, Diebuster holds many similarities to FF. - fantastic use of animation, especially during battles - wonderfully charming and fun female characters that never cross the line into being obnoxious and retain their charm all throughout the series - beautifully imagined worlds full of life, characters, fascinating world-building and awesome backrounds - fully fleshed out characters with motivations, weakness, strengths and growth - energetic, yet concise and clear storytelling - coming of age story - themes of overcoming one's flaws, weaknesses (as one might perceive them), evolution and growth, escalation and friendship - dark undertones that never become too much to unbalance the overall story and pacing - great pacing - fun to watch - they both have a "screw you" attitude that can be interpreted in more ways than one and very rock'n roll spirit - both are unique and very fascinating takes on their own genres read more