I have a few suggestions to change the features in the WYSIWYG editor.

1. Remove "Color" — I know, some folks love these. But it creates accessibility issues to be able to override the default fonts & colors, and it creates the absolute worst HTML markup I've observed in posts made in Agorakit — lots of spans and deprecated 'font' tags.  I believe 'font' tags and related style properties should all get blocked in Purifier as well.
2. Remove "Remove Font Style" because it's irrelevant after the above.
   
3. Remove "H1" option — The discussion or site title should be the only things at H1 on a page.
4. Remove "H5" and "H6" options — I think they should be allowed through Purifier, but there's rarely a use for them and I think folks are more likely to abuse them as font size.
5. Add "Italics" — I think an `em` is important to have access to.
6. Add "Strikethrough" — Great for indicating edits (and humor).
7. Add "indent / outdent" — These are important for lists! I even wanted to use it for #2 above.
8. Add "Video" (after Picture) — I like the idea of making them explicit, but we should validate if this conflicts with oembed or Purifier first.

I think there are also good cases for adding Tables and Superscript, but I might consider them later, perhaps only for the first post in a discussion. There's several things that I'd probably want in a long-form writing (like "full screen" and "undo"), but probably not a simple comment, so I'd rather set that aside for now since this is already a pretty big change.

reference: https://summernote.org/examples/