Kamen Rider SD Kaiki?! Kumo Otoko

Like Kamen Rider SD, the Gundam SD series is a chibi parody. Everything's done for laughs, and they're chock full of shenanigans, bad puns, and general mockery of the actual storyline.  

Has a similar premise; taking Kamen Rider characters, rendering them super-deformed, and placing them in all manner of wacky hijinks. Focuses on the ten Showa Riders rather than the Imagins of Den-O, although a few (Amazon, Stronger, #2, Shin) are limited to cameos. However, KRSD is one long episode as opposed to several short ones, and has much better animation (despite looking very '90s in terms of art style). 

Both anime are super deformed (chibi) parodies of famous tokusatsu franchises. If you're a fan of the genre, you will enjoy these. 

Anime parodying Kamen Rider franchise, redesigning the characters with chibi artstyle and putting them into comedic situations.  

its a from the same series  

OVAs parodying a famous older franchise, reimagining the cast into chibi characters and making spoofs of the original plot. 

Both animes are of heroes. In Samurai Flamenco, there is a quote about Kamen Rider. And probably is a parody of this anime. 

Old but absolutely hilarious re-imagination of your even older favorite classic show. Forget about story (it's a comedy), forget about beautiful graphics (there is none) - just flip off your brain switch from "Serious" to "Silly" and you can enjoy the show to the fullest! 

Tokusatsu Hero Anime, while Jinzou Ningen Kikaida isn't a SD Anime like Kamen Rider SD Here, its still a Tokusatsu Hero Anime of a legendary series in Japan.  

Tokusatsu Hero anime