Kyattou Ninden Teyandee

Both series show a fine interest in the life of someone who is determined to find out the truth and I believe that this is the closest thing to the sequel of Lain. 

Both dubs are comedic/a parody, rather than a true translation of the original show. 

Both are comedy type shows from the same era of anime and both offer a similar mix of almost steretypical Ninja/Samurai of olden Japan and science fiction elements. 

Both shows feature an old-fashioned Japanese setting combined with sci-fi technology. They're also both hero shows, featuring main characters that transform, as well as villains that have a silly/cartoony sense of humor. One focuses on a team of cats while the other focuses on Wataru & his friends, but I still get a similar feeling from both of these shows when I watch them. 

Both shows center around a group of three individuals (two male, one female) who are members of a secret, powerful team that go up against an underground organization that aims to take over. The three members in both shows also wear color-coded outfits to make them stand out from one another, and both teams use legendary weapons against their foes. One of the members of each team is also a hot-headed guy who often says "teyandee!" The shows differ in that one is a comedy featuring anthropomorphic robot cats, and the other is more action-oriented and features humans, but there's too many similarities here to ignore. 

Both are parodies of many thing - anime, music, films and pretty much everything else, both have simple plot and feature slapstick humour. But Bobobo is much more absurd. 

The same style of wacky, unexpected humor with occasional deadpan delivery. Both antagonists have a flair for unexpected humor and love of Edo-period culture despite living in a modern age.  

They are not very similar but both anime's are a bit childish and don't make a lot of sense. And if you like that kind of comedy, the simple non-making-sense jokes than you'll like this too.