When SocialProfile (and thus its wAvatar class) is available, as is the case on Brickipedia, avatars overlap with blockquotes, as seen on this forum thread.
Giving the blockquote element a max-width of 85% on WikiForum pages (.mw-special-WikiForum) fixes the issue (see my Brickipedia refreshed.css for details), but it's totally possible that SocialProfile is not installed, which is what we'd need to take into account when implementing this fix.