These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Angst? What Angst?: Averted. Lero has a hard time of things until he becomes friends with Rainbow Dash. Even years after the event and having adapted well to Equestrian life, it's made very clear that he still deeply misses his family.
Genius Bonus: Bellerophon is notable in Greek mythology for taming Pegasus, among other things. Verges on Fridge Brilliance when you consider that the normally brash and outgoing Rainbow Dash shows a much more mellow side to her as their relationship develops.