User blog comment:Immolator1001/Reaper design/@comment-3145523-20120502225721

Tentacles remind of Cthulu and you got to admit that Sovereign-Class Reapers have a very interesting shape

You got to admit the tentacles make it more intimidating during the this clip:http://www.youtube.com/watch?v=-13ky0v4CeA] and here

And I think the bug thing was added on as a afterthought to relate them to the geth based on what read on the wiki trivia.