But i thought h e wrote on his fore head once.

That was Cheap Trick technically.

Oh maybe white album

WA is a possibility. IDK if HG could break it?

"His stand isn't good for combat and he can't write on himself."

His stand has good speed and yea he can write on himself. The TSRK series is confirmed to be canon and he does it in there...

I thought it said he couldn't one time. Don't remember where I heard it so I assumed it was the case.

Rohan only stated he couldn't change his memories

^but Araki actually retconned this in TSRK cause this is literally what Rohan does.

The hand

Za hando can tp out but idk if that counts as "deflecting"...

The hand is way too slow