Re: Lego Lass: I would be tempted to Poe her. By which I mean wall her up somewhere, with the legos in place of brick, in chains. (But I'm having a more bitchy and bitter than average day, so take that with a grain of salt, or salted caramel if it helps it go down easier, your call, y'all.)
I would gently nudge.
Re: style stuff: If the game has a generally accepted standard they want or would strongly prefer people adhere to, they should post it somewhere. It varies a lot from culture to culture in online RP, so people may just have a habit of doing things a certain way and not notice. It may come off prissy to some, but most folks will be grateful they've been spared an unintentional faux pas (and/or potentially getting yelled at or vaguebooked about here).