They've already annoucing Casting. Londo Mollari will be played Stavros Halkias.

Michael Straczynski said he chose the Greek-American body positivity activist because "the Character begins as an apparent stock character assigned to the role of a loud jovial comic relief. However, later in the series he is shown to be an embittered patriot of a dying empire, eager to restore its primacy. In doing so, he becomes largely."