I've had my electronics searched a few times by various countries.
FWIW after the first few times I realized that they are 99% of the time they are specifically looking for how you react, your body language, and willingness to just power on the device to prove it's not a trojan horse carrying something. They just want to validate it powers on and is real.

Korea they just will often ask me if my laptop or phone got repairs, ask me to turn it on, login, and show them it can browse the internet. China was more or less the same.

Singapore basically was wondering why I had 2 phones, just told them I found that the one I brought was incompatible for travel and it only works in America I guess. Which they just wanted me to unlock it and show it was a real iphone 5c.

> I have a lot of loli porn which isn't illegal in my country but apparently in the EU they treat it the same as the real deal.
Unless you have your background set to some stupid shit with literal MY LITTLE SISTER IS ACTUALLY A 9000 YEAR OLD SLUTTY WIZARD?!?!! folder on the desktop and explain your point of travel is to anime events; all while being nervous and unwilling to unlock your device. You should be fine. I have tons of anime shit on my PC to kill the time, I just don't store it in the normal MyPics/Downloads/Desktop/etc.

If you're from the US you can unironically go get a shitty Motorola for like 50-60 bucks and just have that as your "main" phone. Set it up with basic bitch shit the week before travel and use it as a burner. It's generally a good idea to have 2 phones anyways if one fucks up or breaks you aren't completely SoL.