Red John is Cho(the clues and the REAL ending)
-He has the elephant http://www.fanpop.com/clubs/kimball-cho/images/29252474/title/1x23-red-johns-footsteps-screencap

-He used to be in a gang which was actually the tyger tyger group
-Cho knows all the William Blake poem
-Just under 6ft
-Always knows how Jane pulls off his tricks
-He likes to beat people up
-He is super smart
-He was in a happier mood when he found he wasn't on the suspect list
-Summer is his accomplice
-He let Lisbon live because he likes working for her despite the fact she wants to hunt him down and Jane wants his blood
- Chow is a madman and anything could set him off but he keeps cool just like Sophie Miller said.

MAJOR SPOILER
IN THE END Jane will find out Cho is Red John and when he confronts him Chow tells Jane his laces are undone and when Jane bends down Chow kicks him in the chin. BUT CHOW uses his powerful MUMBO JUMBO to erase Janes thoughts. Then when Jane wakes up the whole investigation starts again which will probably take 5 seasons to get back to this point.