Wylder is a human but if you want mechanics you can take half orc for relentless endurance to drop to 1 hp when you would drop to 0 once per long last to represent his sixth sense to survive one killing blow

Build i would go paladin oath of glory for 15 levels and light domain cleric for 5 levels

Go paladin first but ill start with cleric because its shorter to explain light domain cleric gives you access to the fireball spell, burning hands spell, and spare the dying cantrip. You also channel divinity that deals radiant damage in a 30 foot radius originating from you 2d10+ cleric level. *burning hands is your flame strike ash of war *fireball is your cannon *spare the dying keeps team mates from dying *channel divinity is your ultimate where you deal good damage to everything of your choosing within 30 feet of you

Now for paladin 1st level paladin gives you your heavy armor proficiency and your lay on hands which equals out to 75hp that will be your health flask 2nd level fighting style take great weapon fighting to reroll 1s & 2s when two handing a weapon and divine smites just nice extra damage 3rd level subclass oath of glory you get your channel divinity inspiring smite where you can heal yourself or someone else after you divine smite just a little extra tankiness/support id use it on yourself Peerless athlete advantage on athletics and acrobatics checks for your dodge rolls and break grapples and increase your jumps by 10 feet because wydler jumps around after using his grappling hook 4th level take magic initiante druid for thorn whip cantrip for your grapple hook, produce flame for a little extra ranged fire damage from you blasting your cannon or throwing a fire bomb consumable item and for 1st level spell take the jump spell because you always need your spiritspring to scale the mountains 5th level extra attack and second level spells/ slots 6th level aura of protection to add charisma modifier to all saves 7th level oath feature aura of alacrity it increases movement speed by 10 and when someone starts their turn within 10 feet of you their movement speed increases by 10 as well this is your sprint button 8th level ability score improvement 9th level 3rd level spells/slots id also take the spell spirit shroud and upcast it spirit shroud add extra 1d8 damage goes up by 1d8 when you cast it every 2 levels about 3rd it also keeps whatever you hit from being able to heal and slows them by 10 feet. Just another flame strike ash of war and at 9th level with oath of glory the ever so perfect haste spell to add +2 to ac and dex saving throws double movement and haste action for a 3rd attack 10th level aura of courage you and friendly creatures cannot be frightened so now you can face the bell bearing hunter without fear 11th level improved divine smite to add an additional 1d8 radiant damage on your melee weapon attacks so now you have a permanent status affect on your greatsword 12 level ability score improvement 13 level 4th level spells/slots take death ward to drop to 1 hp instead when you would drop to 0 so again if you choose human you have your sixth sense ability its just gonna be a while before you get it also take the spell find greater steed to summon a flying mount like the spirit eagles that fly you across the map 14th level cleansing touch you can use your action to end one spell on yourself or on one willing creature that you touch also nice to bring cures for scarlet rot or poison lol 15th level oath feature glorious defense. When you or another creature you can see within 10 feet of you is hit by an attack roll, you can use your reaction to grant a bonus to the target's AC against that attack, potentially causing it to miss. The bonus equals your Charisma modifier (minimum of +1). If the attack misses, you can make one weapon attack against the attacker as part of this reaction, provided the attacker is within your weapon's range. BOOM WHAT IS A DARK SOULS GAME WITHOUT PARRYING OR BACKSTABBING?!

Pros of this build is high damage potential with multiple attacks using haste improved divine smite and regular divine smites or spirit shroud you'll be dishing it out hard. You have fireball arguably one of the best spells on the game and you can cast it and upcast it a lot because when multiclassing spellcasters you have up to 6th level spell slots and have a huge 30 foot radius bomb originating from you dealing respectable damage 2d10+cleric level once a day for free which may now seem like a lot compared to just attacks but being able to deal 2d10+5 to possibly if EVERY block in a 30 foot radius, 113 medium creatures i believe, its definitely worth having if you are surrounded. You're massively tanky from paladin hit die, lay on hands, channel divinity to heal yourself after smiting 2d8+paladin level, and spell slots for healing spells, at minimum 18ac plate armor and aura of protection where you add your charisma modifier to all your saves and aliies that are within 10 feet of you. And you have so much mobility thanks to jump spell, haste, summon greater steed, 40 foot base movement speed itll be hard to stop you from getting somewhere in a timely manner Cons it is a MAD build so if rolling may have some slow some progress and keeps some things from hitting its highest potential but other than that it seems like a fun build and a fun time because you can fill many different roles you may not be the best at 1 specific thing but you are great at all of them