Ugh, how original
. Portable screens are literally everywhere nowadays... like every single person I know has one. Wireless headphones, though - those are actually pretty useful. I mean, who doesn't love having a good pair to block out their annoying family members while they're gaming?
And phone accessories are always a safe bet... as long as you don't get them the ones with unnecessary fancy features that just add to the cost. Gaming peripherals can be cool for serious gamers, but I'm not sure how much of an impact it'd have on, say, your average player. And streaming devices? Meh, if you already have one, yeah, go for a newer model or something...