I'm testing it live. Seems to work okay ... https://random.hellyer.kiwi/

Some things don't make sense for me, as my avatar is displayed beside each post, yet I already do that in my sidebar. Plus, I'm the only author, so a per post avatar display doesn't make as much sense as displaying the avatar across the whole site (hence it's in my sidebar).

It looks to me like a worthy replacement to Twenty Fifteen despite it perhaps not being the best fit for my own site(s).