you won't find any similarities
sure, there are some heroes whose abilities are similar (twitch having life drain like terrorblade/pugna from dota, or annie's ult being similar to infernal/malphas), but no one will have an entirely similar ability set
it's best to just play around and find your favorite
personally, my favorite was kennen (energy-based hero, it's fun to be able to spam endlessly after being limited by mana), but after playing enough LoL and then playing some more HoN, i stopped playing LoL because it was similar to playing DotA, then HoN, and then attempting to play DotA again - you just can't stand it