For an intro, please, please, please, please, PLEASE, keep it short (bXd, I'm looking at you). RJ's intro should be about the maximum length you should aim for. Keep it simple, just your logo fading in or over a short clip or something.
Outro gives you a little more freedom. Maybe overlay your social media links over a short clip that doesn't fit in the video anywhere. Or just cut to a screen with your logo and links. Or "sign off" after every vlog and overlay your links and sub button. If you're really fancy, have an outro screen with video inserts to older videos+sub button+social media links.