Misira Nui Chronicles
A Bionicle fanfic that I've been working on intermittently for years, alternately writing and making illustrations of its characters. Character shots for the Toa, the heroes of the story, are posted here. Admittedly, they're getting a bit old now (all date from early 2017 or before) and I'm looking to re-do them at some point, but I did learn a lot by making them.
Toa Oduna of earth.
Toa Garta of water.
Toa Scorzen of Sonics.
Toa Tykal of Iron.
Toa Ilani of Lightning.
Toa Telzin of Air. This one was completed considerably later than the rest of the series and features some changes to the basic design, especially in the hands.
Sketches of the Matoran who later become the Toa of the story. These were done much more recently than the full-color character shots, and hence feature a much cleaner design.