Alrighty...Here is a fight scene between Jonn and a superstrong/durable bloke,Jon gives him a fairly savage beating,and ends it with a very harsh phasing attack..
Here is basically a scan of Jonn cheapshotting an incredibly amped Etrigan,Etrigan is unfazed,but i just like how Jonns speaking in rhyme as he does it.
A display of Jonns Shapeshifting prowess as he creates copies of his wife and child with his hands,as well as shapeshifting into other martians and living out their lives.
Here Jonn is first teleported to earth and then caught in an explosion and surrounded by flames.Despite this he pulls himselftogether to Lift a wooden beam and smash out of the house.
The tale of Jonn 1 million,Shows that Jonn is ageless and survives that long,and also that Jonn was responsible for battling an army of monsters for over 20,000 all by himself.
Antares is about to explode,So Jonn grows giant and throws him into space(note Jonn is in mid-air when he grows,so he didn't steal mass from the earth)
Jonn shows his remarkable Telepathic abilities,as he seals the incredibly powerful Bette noir(a being of pure psionic energy)inside her original body,trapping her.
Here we have some context of When Jonn shapeshifted and pwned the league.Basically,Jonns brother(who's respect thread i'll make) Incites the league against Jonn.Jonn takes a cheap shot from Superman and an energy blast from orion as well as a mild blitz from Flash and is hardly phased,even Orion asks how he can still be standing.
This is a fairly awesome shapeshifting feat,as Jonn literally merges with the ship so that it can dodge the energy blasts,he also creates another head to talk with and sends out a telepathic shout that breaches the mental barriers of every Saturnian there.
Now we see here that the JSA has called Jonn in to help train sand,Starman,Stargirl and Hawkgirl.Even the JSA comment on what a beatdown it'll be.(Though to be fair the 4 man squad are inexperienced)
This is Jonns meeting with Abin Sur,As Jonn is distrustful of Guardians he is hostile to both GL and the criminal,dealing with them with shapeshifting.
Jonn telepathically tortures an arsonist,making him think he is on fire.He then mindwipes his partner,before putting Batman in his place by informing him that he could wipe Bats mind,but he won't.
Jonns frst meeting with the Spoectre had them fighting against a necromancer lass,owning zombies.The Spectre tries to deal vengeance,but Jonn steps between them,showing that No-one F#cks with Jonn.Then the chick fuses Jonn with the Sectre.
Jonn uses his shapeshifting to overcome a superstrong timebomb kinda guy(The man offering the morphing drug said it made you stronger then Superman,but i'd put money on it being BS)
After being set on fire and beaten Jonn is still able to beatdown a man,Throw two buses,set off some landmines unharmed and make the men all see their greatest fears.
A page showing Jons exploits on Apokolips,shows shapeshifting,states that Kanto could never bring him in,and shows that Jonn at least stalemated Kalibak.
Here Jonn is telepathically made to relive all the saddest moments of his life over and over again,in an endless loop.Showing that BA overwhelming him with depression was PIS,he still keeps on trucking and saves a man from Von trapp.
"Z" an ancient telpathic machine puts all of the JLA in Telepathic illusions.While they all work it out,Jonn isn't fooled for a second and teaches Z about who he's dealing with,while showing he knows the JLA's fears.
Finally,Jonn is telepathically talking to Oracle from another dimension,then she gives him a diagram to give to GL,but since Kyle can't handle it alone,Jonn uses Broadband TP.