Top Lane:
: Stacking is the key, don't go for kills unless their free
: Snowballs hard early, play aggressive if your winning lane post-6
: Hecarim is a monster in team fights E ult combo can 1 hit carries
: Snowballs hard with a passive that can block a turret shot, falls off after 30 minutes though
Jungle:
: Near infinite sustain, nunu can solo dragon at lv 3, just don't build
: Similar to Sejuani he has better ganks, flash body slam... and fast clears
: If you can't just a successful gank off, you can hard farm and delete carries in team fights
: Can build either cinderhulk or warrior depending on team comp, very versitile
Mid:
: Easy to last hit with, Semi-Global Teleport, point and click stun,
; Hard to gank, Lane bully, just don't blind pick or pick into a
: Aoe Stun, Reset on main attack, Great Aoe Damage w+r
: Harass lane opponents with Silence, and using Q to stop ganks
ADC:
: Sit Back and farm
: Very easy to play, hard to learn spell shielding right, insane wave clear
: Good harass, Aoe slow and a stun
Has a slow and a stun. and OP Crit rockets
Support:
: A God bltz can get your adc fed
: Insane Cc, great all in level 2, Strong engage
: 2 stuns and a heal, very strong in lane
: The countless times you will save your adc and get nothing in return

Champions you mentioned:
: At 500 stacks she becomes a monster, Bursting carries hard, but is very very squishy
: Low mobility, counters
: Crit Rockets OP, can melt towers and tanks
: All he does is damage, his ult rank 1 is meh, and his sustain as a jungler is terrible