Released alongside Update 20 in early 2017, Octavia is one of only several frames with their own acquisition quest, Octavia’s Anthem. This is a really enjoyable quest (although frustrating at times), that has a very original story thread running through it – I do recommend you play through it if you get the chance.
If you haven’t gleaned it already from the name, Octavia is the music frame, the diva, with highly original Abilities that utilise rhythm and melody in a very unexpected, but extremely effective way. Useful for a number of different mission types, and welcome for her support Abilities, Octavia is pretty much a “must have” frame, although it is true that there are other frames that are just as effective.
Note: while you acquire her main blueprint from the Octavia’s Anthem questline, the rest of her components can be a struggle to farm. Her Chassis Blueprint is a guaranteed drop (yay!) from the Lua Music Puzzle (boo!) – so you first need to be lucky enough to find the room, then clever enough to figure out the puzzle (it’s not that hard, and we do have a guide in the works). Her Neuroptic blueprint, though, is a reward from Rotation C of Orokin Derelict Survival, and her Systems blueprint is found in Rotation A Caches of Lua Crossfire Exterminate (a good choice when hunting the Music Puzzle as well, I might add). Clearly, the Neuroptics is what will drive you mad.