The other thing Klingons have been established to have is a craving for self-improvement or sheer self-makeover through technology. Which goes well with the one pertinent fact about Klingons: that they look different in their every appearance! Indeed, TOS already featured three rather distinct sorts of Klingon in about five episodes featuring the species, setting the precedent... TMP and then ENT and DSC just took that further.
Constant self-manipulation might show in things like blood color... Pink this year, greenish the next, and dark red when it needs to be (such as when Klingons bleed in TNG or DS9 or VOY or ENT).
Timo Saloniemi
And nothing like that has ever been "established" and all that is, is your personal fanon.