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My character is a giant-slayer living in the far North with his family. He is able to bend and generate magnetic fields. The only technology he could use would be something like Feudal Japan and/or Europe.

The giants are very slow creatures but 7 times stronger and bigger than humans. They can smell humans and feed on them. On the other hand the small amount of people in their territory determined their species to remain at 100 specimens.

Giving this information, what type of tools/weapons and even armor would he use?

Since the giants are slow and strong, I would recommend just running around naked. That will make your hunter extremely light and nimble and so that they can recover from their I-Frame dodge rolls quickly. Armor is of little use if the creature your fighting is both 7 times larger and stronger. Nothing is going to really protect your from one of their attacks, so armor should really just be clothes based on the environment you are hunting in.

As for the weapon, I would recommend poison. There are many lethal poisons out there that even in small doses would kill a giant. So while a drop might kill several humans, a couple more drops will kill a giant. And since they are slow, you just stab them with a needle several times (the needles size will have to vary depending on the giants skin thickness and toughness) and run away and wait for the poison to do its work.

Fighting one or two giants are easy, but fighting a group? that's one thing to consider.

You can't become a "Giant slayer" just because you killed one, you have to have killed a plenty.

That being said, I do think giant killer is a wrong title as your giants are WAAAAAY to strong and WAAAAY to tall for someone to kill with a blade, even with poison. At that height, the most weakest point of the giant is the feet. big, range weapons will penetrate those but they are a burden to carry by one man.

A more plausible approach might be, The Giant killing army.

Your army can, scatter long, steal spike, drench them with poison, then cover them with forestry.

Your main weapon for killing them will be ballistas... Lots of them, as they are the weapon with the highest percentage of killing a giant without any casualties.

There should be one improvement however, you ballista must have a reloading mechanism similar to a Van Helsing's repeater crossbow because you need to reload as quickly as possible, but pack a punch too.

one of your problems however, is that you got 100 persons, give or take that some of them are women, or grandparents and kids, your army lacks manpower, 50 might hold for some time.

I also suggest to be on the defensive rather than taking the fight too them, setting up traps is the best way to kill the giants, you need all the manpower to protect your people and ensure continuity of the human race.

another problem is giant carcass, yeah you killed them, but if they die close to your encampment then then stench will kill you as well, so you better plan your traps, how you set your encampment, and how you can engage the giants with your ballistas on the encampment, and during the move.

you will have a pretty busy life if you ask me...

The smart path would be to use a crossbow or longbow and to shoot the giants with poisoned arrows while on horseback (He does not have to shoot on the move. He could just kite the giants by shooting and then moving away, then shooting again).

Keep in mind that the giants would probably be able to throw rocks at him, so he would have to maintain some distance. Also, the giants are quite large, so it would take a lot of poison to kill them. The smart thing to do would be for him to have several people accompany him.

He would want to avoid melee at any cost, as even a glancing blow from a giant could smash his head in, no matter what armor he wears. Digging pit traps with feces coated stakes on the bottom and luring giants into them could be viable. Carrying some caltrops and scattering them behind him might be useful, but the giant might just walk around those. They would be quite effective at night.

Also, he might want to wear at least a gambeson. Even if it would not protect against melee strikes or thrown rocks, smarter giants might throw clay pots full of small stones at him like hand grenades, and he would want some protection from that.

"He is able to bend and generate magnetic fields" - Does it mean he can manipulate metal as he wants? Well... in that case "Avatar: The Last Airbender" comes to mind with metal benders (rather less accurate, meaning it's more like throwing and shooting metallic objects), or X-Man with Magneto (full, precise control), or even Irelia in League of Legends.

In both cases he'd carry large blades around, either swords or just the blade parts. When he fights he swings them around on range, pierces his opponents, performs attacks from their backs (the blades would return). Against giants he would go for the weak spots, which he can reach unlike normal humans.

As armor he'd either carry leather (in case the metal interferes with his abilities if it covers his body) or an armor with metallic parts, which he can optionally use as weapons or as defence.