With today's update Jagex added pre-made preset options for the maxed/comp capes. There's a list of 29 secret hidden ones which you can unlock by typing in a name. Here's the list:
mod ramen
mod ryan
mod chris l
shooting star
wiki
mod stacey
clover
mod shrike
mod iago
johnna
mod helen
mod shogun
mod blkwitch
mod shutty
mod luma
bisexual
pansexual
asexual
lesbian
intersex
transgender
nonbinary
genderfluid
agender
ashoka
trashcan
mod easty
sailing
mod dragon
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