Some of the more obscure examples:
1. KISHIDAN x Hello Kitty
KISHIDAN (psh like I can read that kanji) is the band of another incarnation of DJ Ozma. I find his other alter-ego in Yazima Beauty Salon problematic (for a while I didn't realize the group was essentially doing blackface), but I didn't know this was the same guy who dressed up in a Nazi-esque uniform a few years ago. Maybe I wouldn't have bought it with that many strikes against him, but too late. HK with that hair is pretty hilarious.
2. Solar Eclipse Hello Kitty
We're gonna have a full solar eclipse soon, so OF COURSE there's HK stuff! I'm gonna get up early next Monday and look super fly with these on while I witness the majesty of the universe without going blind.
3. Daibutsu Hello Kitty
Picked up the strap and washcloth in Kamakura. I left the towel on some homemade soap my brother sent me and now it smells good~
BONUS SHIBUYA HACHIKO DOMO-KUN!
Domo-kun isn't nearly as ubiquitous as HK, but I see him enough that I know his brand is doing all right. In fact I see A LOT of One Piece and their token "cute" animal character, the reindeer Chopper, at all the major tourist sites around Tokyo.