a Nearly maxed player & long-time game veteran here,
just going to write out a few things I've noticed recently during gameplay & make a few minor suggestions:
1) As also vocalized in somebody's forum post on OSRS Content Suggestions, please give us the option to make a Champion Cape Max Cape version.
I'm nearly Maxed and I currently have a Champion Cape that I've recently achieved. I'd really like to show it off in the form of a Max Cape once I'm maxed.
2) Come out with an even more difficult and upgraded Champion Cape/Champion Challenge. The current Champion Challenge involves killing really low-leveled monsters in the game, & subsequently challenging relatively low-leveled easy Champions.
Why not introduce an Elite Champion Challenge involving high-leveled creatures (excluding bosses since those can't be easily killed in large quantities)? -involving monsters such as Dragons, Black Demons, etc. ?
It would require a regular Champion Cape to be achieved before being able to attempt the Elite Champion Challenge, therefore making the Elite Champion Cape one of the scarcest and most revered capes in the game. Especially when given the option to combine it with a Max Cape.