Tengen Toppa Gurren Lagann, Star Driver: Kagayaki no Takuto Recommendations
Star Driver is obviously very influenced by TTGL when it comes to the mech battles. The over the top animation style is the same, the beautiful universe background during the fights comes from the final battle from TTGL as well. There are many other similarities throughout the show.
Star Driver has a very enthusiastic tone similar to Gurren Lagann, along with colorful mecha battles and fun characters. Star Diver, however, has a splash of fabulous like Gurren Lagann has a splash of badass. Would most definitely recommend to anyone who enjoyed Gurren Lagann, and vice versa.
Both series throw you in some ridiculous universe, with funny animated fabulous super-mecha fights, while focusing on character development and story. While Star Driver focus more on "romance trio", the story on tengen Toppa is much more meaningfull, and further developed.
While Tengen Toppa has some issues with early episodes (some even suddenly becomes really bad in terms of animation), You should stay. I can't imagine someone who liked Star Driver style not fall in love in Tengen toppa :)
Mecha, action, fighting, and a little romance. Both of these series contain a lot of mecha action mixed with sci-fiction although Star Driver goes into the slice-of-life theme a bit.
When it comes to Mech Battles, Star Driver & TTGL are very smiler, especially in the last episode where Star Driver trying to deliver the same amount of epicness for the ending.........over all SD & TTGL are both well made Mecha/Shounen + Romance series with amazing soundtrack and voice acting
Both have great animation, great characters, great action, and they are both just good anime if you like mechs and storytelling combined.