First, it's not a "hello kitty" umbrella--it's a "hello mutant" umbrella. Yes, that matters; see Dungeon Crawling Fools, which, unlike the online strip, carefully avoids using the words "illithid" or "mind flayer."
Second, it's a pink umbrella, a humorous prop, not a fairly major character.
The second clause is why the creature in the darkness is probably not going to turn out to be a "Snarlox."