The first is the one who essentially plays his real life self on screen

Tom Cruise, Ashton Kutcher, Samuel L. Jackson are a few that come to mind. Then there are your actors who completely transform themselves to get into character. This means his Castmates were subjected to weird and unusual Joker-like acts of generosity from Leto.
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Jesus:
I felt miles apart) We didn't have sex (But I gave him a good hand job.) he was more distant, I'd sit beside him and he'd run to the other couch.
(6 September 2016)

Jesus:
And although he did sleep close to me (he has a HUGE bed.
(6 September 2016)

Jesus:
When not on the move, all we did was watch movies. never went anywhere. didn't even talk like before.
(6 September 2016)

Jesus:
Always running errands, or on the phone.
(6 September 2016)

Jesus:
He took the weekend off and stayed home an extra day to be with me but the whole time I was there he was distant.
(6 September 2016)

Jesus:
He lives in ATL and I'm in Miami.
(6 September 2016)

Jesus:
He'd get quiet and say something like shorty.
(6 September 2016)

Jesus:
And I'd joke like... What did u just call me?
(6 September 2016)

Jesus:
He would drop hints by calling me babe.
(6 September 2016)

Jesus:
We'd have great debates, laughter, just everything was perfect for two months over the phone.
(6 September 2016)