champ mecanic seems original and pretty cool to me, the one thing I dont like about her is her passive, bonus effect to normal abilities at rank 5? really? well yeah thats cool i guess it kind of gives some extra there but... you could have added that without wasting the passive, I mean in a normal game playing regularly the first ability we max gets to rank 5 until level 9 (general scenario) so I basically spend early game without a real use for my passive, then at level 9 it starts to function in 1 ability, sure its cool to have an added effect but doesnt take away the fact that 9 lv passed and my passive was worthless and then more levels have to pass until I max my second ability and then until lv 18 I get my passive to work on my third ability.
Sure this is a real TLDR but my mayor concern its that the passive does nothing until you get each ability to rank 5, sure thats the idea of the mechanic, you have to think carfully wish ability is more useful with the added effect so max that one and bla bla. I get that but still I dont like wasting a passive in that, I know passives are not supposed to be game-breaking abilities but making a passive that has an effect that abilities could already have seems like a waste to me, sure thats my opinion I know this may seem like a lot of non-sense but if we think it carefully it does make sense.
Anyway the concept and mecanic seem great, I like the champ and Im looking forward for her to come out. Keep it up Riot!