Rumour: Super Smash Bros. coming to Switch in 2018

Something that lots of Nintendo fans have been asking for is a Super Smash Bros. title for the Switch, and if industry insider Emily Rogers is correct, that's just what we're about to get. It will apparently be announced during the summer (speculation: E3 maybe?) and released later this year, with Rogers claiming the following:

1. A Smash Bros title will be announced and released for Switch later this year.
2. They added brand new content and re-worked some of the existing Wii U/3DS content.

Rogers later clarified in a tweet that she doesn't know if it will be an improved version of Super Smash Bros. for Wii U or something completely new. Of course, this isn't official in any way so take it with a pinch of salt for now...

Now that you've sprinkled your salt, let's speculate: Which Nintendo character that wasn't in Super Smash Bros. for Wii U would you like to see added, and which guest character do you think would be a good fit for the game?