My experience:

I got him twice in lucky stars wheel:

1st try: I spent 5200 coupons (3* him, 80 frags)+claimings

2nd try: Actually spent 30k but didn't get him (you still get power things by claiming points)

3rd try: I got 100 frags of him (and made him 4*) spending only 800 coupons

I never tried other events like tsukuyomi or sakura (I just wen for Ino's Flowers once).