A thing I really love about Mari is that she saw a legit mermaid, the mystical fantastical fish woman creature, and said "wharever" and brought her home as her new roommate essentially
And now we have her freaking out that a random dude saw her girlfriend's friend's fish tail. So we know that she knows that if ppl saw what Lara is she (Lara) could be in trouble and she (Mari) isn't just "wherever" as a "look how umbothered she is at the supernatural stuff" gag but she really consciously accepted a mermaid knowing how most ppl would react and took her in
To be fair her betta fish can talk and keeps using her Alexa to order cake off Amazon
Or if u wanna be more realistic Grace told her abt the existence of mermaids beforehand













