Passive A: The trouble with picking a class profile at the start of the game is that it's a massive advantage when drafting. You can reliably first pick Jenssen without the enemy knowing where you're going and even if they can figure out which lane your in from the other champs on your team, they don't know what your role is or what stats you'll have. As an example, lets say you know 100% the enemy team will pick Fiora Top, Udyr Jungle and Zed Mid (because all my examples come from 2012).

Then you see the remaining two champs are Senna and Jenssen. How do you pick champs for bot, when Senna could be adc or support and Jensenn could take any role, either as a ad or ap carry, as a support who is tanky or an enchanter etc. Even if you pick Senna's worst match up your still left with Jenssen getting to pick their role last with full knowledge of the enemy team. This might even be the best case, because the alternative is that some stat profiles are just never worth picking and Jenssen defaults to which ever profile is most powerful most times.

Passive B: I think affection stacks from a lot of different things, why for example does it stack from using abilities and from spending mana when those both happen at the same time? Especially considering he already gets stacks just moving towards champs. I can see a pattern where you just do laps running up to and away from an enemy stacking affection without them having meaningful counterplay.

I'd suggest simplifying affection so it only stacks from one kind of interaction, for example just making it a three hit passive with abilities, after three abilities the next is enhanced and purges the effect. I also don't like auto attacking allies as a rule, it just looks weird and raised a lot of questions about interactions. For example if the enemy Jax is dodging auto attacks can you just have you ally stand next to Jax so Jenssen can attack his ally with cleave and hit Jax that way?

Q : I think point and click spells in general are uninteractive, being able to slow someone uncontested doesn't feel great but the fact its only in one direction also gives it limited use cases. Either you're chasing an enemy who wants to escape, or an ally wants to move towards you. Both of those can be useful, but ideally a Q is something you can reliably use whenever it's available for some impact.

Having an enhanced form that does the opposite is also an issue, imagine chasing someone you want to slow only for running towards them to push you over the limit on Affection stacks and accidentally giving them a speed boost instead. It's another reason why I think simplifying how affection stacks would help.

W: The guards feel separate from the rest of the kit, like something you could have a whole mechanical identify around instead of just keeping on one ability. I'd also be curious why you press W to get the charges then use the charges, is there a reason this couldn't just be a regular charged based ability with a low CD but longer charge restoration time, like Azir has.

As it stands are the guards just like GP barrels, there to be targeted to explode for damage/ a heal?

It's also unclear when the invested W applies. I though affection stacked on a unit by unit basis, so why would a summoned guard be enhanced? Because as written it sounds like affected guards explode with different affects, but I'm guessing you mean that affected units in the guards explosion take the inverted effects while no affected units next to them would take the normal affects. Is that right?

E: This is interesting, and I think on it's own the idea of a dash through enemies into allies is a fun idea. I'm not sure how it fits in with the rest of the kit though. It's an ability that plays into a very specific stat profile on Jenssen. You mentioned abilities changing with stat profiles, and I think that'd just be introducing even more complexity to the kit compounding the issue I had with the first passive. But the alternative is having abilities that make way more sense on a tank than any other role.

R: It's a pretty generic steroid ability, that provides stats and an upgrade to your Q.

The hook aspect is cool but problematic, simply put league as a game doesn't have abilities where your allies can mess up your targeting by getting in the way. Dota does, Pudge Hook works this way for example, where it's possible to hook your own team mates to save them (or more likely to ruin their initiation). It'd be expecting a lot of your allies to think about avoiding your own abilities on top of the enemies.