It's time for.... you all know it... you all love it... "Oh my god, Kate you've been drawing the same OCs for twenty years!?"
Here we go... with the most vintage of all the Rekki arts (with bonus spiky Subo):
Then something a little later, once I'd decided she was getting her own comic... (Side note, I do like that several things 19 year old me wrote about Rekki here are still true now. She's still 5'3", her personality is still pretty much that, her birthday is still in autumn... though I think she's a Scorpio now hahaha!). Also the fact that Rekki always has a spikey fringe and two long bits of hair at the front and then the back can be worn in any style, loose or up did continue basically forever.
A later Rekki with a very recognisable design. The sword has a point though! Unacceptable!
(it is the correct colour at least, bright red with brass fittings). This was the "Rekki has freckles" era. I'm kinda "meh" about freckly Rekki (Frekki?) but it was a whole thing I was doing when I was around 20. She'd become left-handed at this point. Her sword always goes on the right, and she always has that really exaggerated stance when drawing it. Ahh this one one of the first art prints I ever sold! Nostalgia~! 
This one has Sarin on too because it's a chapter cover from the old version of Fan Dan Go (it got rebooted twice, then rebooted again 9 years later as Errant). Apparently 20 year old me had NO IDEA how tall 6 foot is compared to 5'3" because this Sarin is a goddamn giant. These outfits are absolutely horrible. I'm judging you, past me. The drawing isn't too bad though at least. Also this is where the little crease under Rekki's eyes just started to creep in to hint at the fact that she's an insomniac. It got more pronounced over time and subsequent reboots.
Now this is a more recognisable Rekki from when I was about 24. I barely changed this design when I rebooted the comic as Errant...
As you can see! Basically just some tweaks to the colours to pull things together a bit better and look less garish. Subo is here looking a whole lot less spiky. The pose on this cover is a callback to the one on the previous cover, because yay! First print book of the reboot evokes the print book of the original! One consistent change is that Rekki's fringe tends to have fewer spikes now, and they're a bit softer.
Bonus chapter cover of Rekki's latest outfit with her hair down and a more rebellious, casual look to perhaps reflect how she's feeling about her position as a knight right now. AND she's back-to-back with Sarin again! (this was kind of a deliberate callback....for...um....basically just me, because who even remembers the old-old version of Fan Dan Go
). Sarin has a way cooler sword now, and much better clothes. 
I feel like I could make another entire one of these posts just about Jules... but I'm gonna stop here for now. 