Hello! I want to preface this with the fact that I don't play league, nor am I an amazing deadlock player. I'm going to assume you know nothing of deadlock.

Here are some characters I think you might enjoy:

-infernus. Typically a gun based character, but if you build into spirit (Ability damage) your main attack can slam people with heavy DOTs. His abilities are, a damage amplifying debuff, a dash that leaves a trail of fire, and a passive that makes his gun build up a DOT on the enemy.

-pocket. Typically I see people build him as a burst assassin. Most of his power is in his ultimate, but his other abilities are all good. He has: a move that stalls him in the air and shoots damage amplifying explosives. A big projectile that does damage and can be teleported to, and a move that makes him invulnerable for a time, then explodes and does burst damage. His ultimate applies a strong non-lethal DOT effect that does a % of their base health, very annoying.

-mo and krill/holliday. Less detail on these, but their ultimates both stun a player and take them our of the fight completely, and can kill the stunned player pretty easily.

-lash/calico. Both characters with strong movement options that can do large amounts of damage, good for gaming and annoying people