If you're looking for manga similar to SD Gundam Sidestory, you might like these titles.
Journey back to Lodoss Island for tales of dragons and dwarves, paladins and princesses, magic and...madness?! All your favorite characters from Record of Lodoss War are back and sillier than ever in this series of madcap short strips that poke fun at all the high fantasy stereotypes you have come to love.
You saw his work in Neon Genesis Evangelion: Comic Tribute... depicting the truth about Rei with great sensitivity... Wait, that’s not the right word. What’s the opposite of “great sensitivity”? Well, whatever it is, Tony Takezaki’s got it, in this collection of all-new stories satirizing the Evangelion you saw on TV, as well as some scenes that apparently were never aired! SEE! Eva as a 1960s TV show! SEE! Kaworu and Shinji’s standup comedy career! SEE! Ritsuko’s days as Gendo’s student intern! SEE! Eva Units, flinging dookie! You’ll see all that and more, because this is Tony Takezaki’s Neon Genesis Evangelion!
Koha-Ace stars Kohaku and features characters from various TYPE-MOON series. It is drawn in a super deformed style, and it is a self-aware series that constantly breaks the fourth wall.