>>50368364A warden supervises and enforces something, in Kronii's case this means she strictly enforces the rules of time, not necessarily in a positive or negative way, simply following the rules. A keeper meanwhile is a caretaker and actually looks after what they are keeping, in Fauna's case this means looking after nature in a more protective sense than how Kronii enforces time. A guardian similarly is someone who guards or protects something however in Mumei's case in regards to Civillization it's more of a sentry type role instead of a caretaker. She protects civillization by protecting it from outside threats and manipulating it in certain directions but otherwise she simply observes where it goes; this is not like Fauna who is constantly involved with nature.
Here's some scenarios to illustrate the differences in the roles: it wouldn't matter if the flow of time leads to the death of all life/the universe in the end, Kronii still enforces the linear normal flow anyway simply because these are the rules. Meanwhile, if humanity/someone else became too much of a threat to nature, Fauna's role as keeper would mean she would actively go against them to stop it, even if this brought her into conflict with Mumei, for example. Mumei meanwhile will defend civillisation if it is under attack but won't interfere with random people's everyday lives or save them from harm in the same way that Fauna cares about preventing harm coming to nature. Fauna would try to stop a species from dying out/a landscape from being destroyed whereas Mumei wouldn't care if one society collapsed and fell into ruin as long as the overall progress of civillization marches on (in fact Mumei has probably even instigated things like this; this is why she is not the same as a keeper)
