A girl who has a crush on the protagonist obtains their number via unknown means and sends anonymous text messages. Thankfully, this girl is harmless, just very shy.
Episode 4: The transmasculine character Sage talks extensively about how he does not feel that he's taken seriously by his parents because he is transgender and gender nonconforming. He feels out of place sometimes because his natural way of expressing himself makes people assume he is younger or less mature than he actually is.
Well the implication with the meteors is that everything will die, so technically, (and the characters are anthro dinosaurs), but no animals are seen dying on screen.
Similar to the answer about animals. Everyone dies at the end (this isn't a spoiler). However it's not in any bad faith or "bury your gays" type of stuff, they just happen to be part of the population like everyone else who also happens to be dying.