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.
Crazy Awesome: Bjorn the Bear, a sentient bear who can talk. He was kept as an abused pet/slave of Morinth until Shepard distracted her during Samara's Loyalty Mission; he broke free and mauled Morinth to death afterwards. He then proceeded to set up his own base of operations on Omega. Also, he thinks that all Asari are Dark Elves and feels that he owes a debt to Shepard.
Hilarious in Hindsight: You can find a report in Mass Effect 3 of a Cerberus operative's ocular flashbangs actually making someone's head explode, just like in the fic.