Welcome champion of the realm to the complete guide on playing viktor in paladins.
Let's begin shall we?

There are two main playstyles i will be covering in this guide which matches the loadout and legendary featured in this guide.

Flank (Aggressive) - This playstyle requires you to focus on a single target and always monitor your health if you get under/to half health you should try and retreat to somewhere you can heal too, as in most cases you won't get any healing from your healer. The best way to stay alive and have more pressure against the enemy team is to be with your teams flanker. A good combo for this is andro due to his ability of finishing off targets. I would recommend this option of playstyle if you have the ability to communicate with your team members and or your flanker. If not i would recommend going with the other playstyle.

Backliner (Defensive) - This playstyle mainly focuses on lowering shields and doing damage so your flanks or your other team members can finish them off. The best place to stay on the battlefield would be near your healer behind the tank but not so far back that your dmg has fallen off, a good example is where a series might stay during a battle. This playstyle is mostly reliant on your healer helping you if flanks (Yes including you Flanknando ) are coming behind your lines (As viktor you're most likely their main target due to your squishiness). This playstyle is my go to most of the time as most times you can help your team efficiently without making yourself susceptible to the enemy.

Due to Viktors ease of entry when playing him there are only two things that really matter. Both of which mainly improve by playing him.

Tracking/Aim - what most people think is the important thing to have playing viktor and is pretty self explanatory

Grenades - what I and most high level viktor’s/players believe is the most important thing. Hitting your grenade is the first thing you should do in most cases due to the fact that you get 15% bonus damage for 4 seconds after you have hit them, which is insane with the Gunnery legendary card. So how do you use it? Well in close range when a flank is in your face rebound it off of walls or the ground (Sometimes hitting that dictates if you live or die in those circumstances) as for medium to long range (e.g. a drogos or evie in the air) hold down the grenade the longer the time, the shorter the grande explosion time will be. Practice both of these on viktor over time you will get used to when and how long for every circumstance. Like most things practice is key.

This is my tried and true loadout i have been using this for over 20 patches now and has never let me down .

As for what legendary if you're playing Backliner always go for gunnery, for Flank go for ether gunnery or Cardio.

Im a lvl25 diamond viktor and have over 300h and 1k matches on him (i know i have no life) and my best advice i could give you is just practice him no matter what you will always improve. So good luck champion and i hope to see you in the realm.

This guide can also be found here - http://aminoapps.com/page/paladins-amino/365771/complete-guide-for-playing-viktor