See, one of the many things that I like about Cinder is that a lot of his accessories pair really well with his actual colors. That said, I tend to use a lot of different pairs and just switch in between matches.
Jago: the “default” ornate wooden mask/kneepads work with a lot of his colours, so I’ve been using them with colours 6, 5, and recently 2 mainly. I also bust out a Templar/Red Cross-style red ornate wooden mask/kneepads/sword with colour 4. I’m probably most fond of block ornate wood with colour 9, though. As much as I’m a fan of default Jago, I almost never use him; and I don’t like the ornate steel and ancient tiger stuff.
Glacius: I’m far from having everything unlocked, but I’m fond of the black and pink, and generally either of the non-ultra edition accessory sets. Usually I rock pink with horns.
Fulgore: usually either the stalhrim, black and white, green or red robot (I don’t have 7, 8 or 9 – if I did, I’d probably use 7 and 8 too), almost always with dreads and the parallel “military” blades.
Riptor: haven’t put a lot of levels on her. I’m almost always on colour 3 (the pink/purple…pinkle?), now with feathered body/head sometimes…but eh. I’m still unhappy about the feather situation. As far as I’m concerned, smooth complete plumage >>> default scales > ■■■■■■ patchy plumage. Somebody asked if we’d support a crowdfunding campaign for costumes and whatnot – I’d be all for crowdfunding a proper feathered costume for Riptor, but somehow I don’t think anyone would go for it. Oh well. Maybe there’s hope for this via PC mods.