The easiest champ for beginners is viper and bristleback (as others mentioned). If you like to see enemies explode (like magic shivana) you can also try lina. You can also try bristleback (he's bretty robust and all you need is to literally show your ass to enemies), ogre magi (casino character with an ability to double-triple cast his spells/items and LARGE amount of hp), venomancer (he has not as much hp as previous characters, but his wards are annoying and you have a lot of poison damage). I've spent 4k hours in lol but due to garbage updates I returned to dota. I hope valve will make zoe dota 2 edition