Kineticists don't normally use actual weapons, but I suppose that spear/polearm might be a kinetic blade. If so I suggest the kinetic knight archetype of kineticist rather than dipping just for the armour. It should work pretty well. It would expect you to use a shield as well though.
That weapon could be a ranseur if you want a slightly better weapon than a spear. A fighter can be decent with combat maneuvers if not amazing; at level 6 they can at least have the greater version of a combat maneuver before most others.
The loss of spell combat makes an armored battlemage worse than a warpriest on the whole. A warpriest is on a high at level 6 too, having as many feats as a fighter if a lower BAB.
BTW, the link on the other thread is right, but you made the same mistake of linking to your search results on this thread!
the vibe I get from the picture is almost holy-warrior ish, but not really. have you considered maybe a bloodrager? medium armor, potentially the destined or celestial bloodlines (just the feeling i get, to get a warrior driven by themselves, or more blessed by the gods) and then you can reskin whatever medium armor, and whatever martial spear you'd like.
Without more guidance to what you want to do with the character specifically, I'm afraid I can't be more help, that just the feeling I get personally
I'm not sure if you care, but the character who that image represents is a Dark Souls boss called Ornstien the Dragonslayer. Fast, uses lightning in his attacks. So... I'd suggest a Bloodrager with the Elemental (Air) bloodline. Lightning sparking off the spear as the warrior darts around the battlefield, stabbing like wild.
There are tons of possibilities that are heavy armored and wield a polearm type weapon.
A standard reach cleric with a long spear would fit, for example.
So I think you need to narrow it down beyond just the picture if you want useful advise.
A Paladin of Sheylyn would be interesting (yeah, the weapon probably isn't a glaive, but there were lots of things called a glaive by different people at different times, and it is close enough to some of them). The armor looks sort of like a art project to me, which fits.
I think a plain Magus that worships Shelyn could work. Weapon Finesse -> Weapon Focus (glaive) -> Bladed Brush. Use your Arcane Pool to enchant your glaive to Shocking and Spellstrike with Shocking Grasp.
To emulate how Ornstein zips around buff yourself with Expeditious Retreat and use Spell Combat with Bladed Dash. To further emulate Ornstein jumping and flying you could go Hexcrafter Magus and pick up the Flight Hex, or wait until 7th level to learn Fly.
Arcane Duelist Bard can cast in medium armor at 8, heavy at 16. Good fighter feats along the way. Lots of potential there depending on what your party needs. Stick the banner of Ancient Kings on that spear of yours if you go with a Bard.
Looks like a Swashbuckler 3 / Fighter 2 / Investigator 1 to me, more specifically Azatariel 3 / High Guardian 2 / Sleuth 1. With a spear, you'd be able to parry and riposte with your charisma to attack and damage. Sleuth allows you to have twice as much panache and High Guardian allows you focus on strength and wear heavy armor.
After 6th you can take a level in Mysterious Stranger Gunslinger for even more panache then prestige to Furious Guardian (Ulfen Guard) for rage. You'd look like those guards that defend doors and halls with a spear.