Keroro Gunso is a very popular series in it's own right, and unsurprisingly this had led to fan-made parodies to surface.
Keroro Shogun[]
Keroro Shogun is a 2008 failed short-lived parody fanseries made in Spain & Italy based on the original Keroro Gunso show.
(2008 Spanish fanimation pilot):
https://www.youtube.com/watch?v=PoZ6yKan1t0&app=desktop
(2008 Keroro Shogun Fanseries Op)
https://www.youtube.com/watch?v=UotKj7VgCZk
(Keroro Shogun fanpilot part 1)
https://www.youtube.com/watch?v=iKVShCjf_58
(Keroro Shogun fanpilot part 2)
https://www.deviantart.com/colorcodex/journal/Why-Keroro-Shogun-Is-Dead-554481891
(Keroro Shogun summary)
https://www.youtube.com/watch?v=ZSo1U1FAxQ0
(Keroro Shogun Italian fanpilot - English Dub)
https://www.youtube.com/watch?v=1T9uNXklZ-4
(Keroro Shogun Italian fanpilot - Original Italian version)
Sgt. Frog Abridged[]
Sgt. Frog abridged is a 2009 American-made parody fanseries created by TheMidnightFrogs on Youtube featuring the westernized counterparts of the Keroro Platoon.