I'm Sorry: Senna
Before we start off, I'd just like to ask why RIOT chose this route especially when they strictly said that they weren't goin to do the whole, "Xayah and Rakan thing" ever again. Anyways, lets go to my original intention.
To those of you who know of Lucian's lore, many of us think it is awesome to finally see the champions of said such lore to become a reality while other's see the toxicity that comes along with it. To those who are unaware, Senna's gun makes no sense to have. To shorten lore things up a bit, Lucian's father was killed by wraiths of the Black Mist which was told by Senna. Senna with an Urias’ relic pistol entrusted Lucian with his father’s pistol after showing promise. When Lucian screwed up, Senna saved him by changing places which is why Thresh had Senna. Now lucian weilds both PISTOLS. Once Lucian releases Senna, for absolutely no reason She weilds a massive "weapon". Bur for the time being, lets just say that the lore is not important. Instead, let's look into her kit and gameplay.
If you play the Lucian Senna duo, you will realize that they are polar opposites. While Lucian is strong, Senna is weak. While Lucian falls off, Senna starts to get strong. What makes this part very sad is that it holds the, "this or the other, but not both" intention because senna does not feel or function much like how a support normally would. As the breakdown begins, Senna's q does both damage and heal in the line of fire. It has insane AOE range to poke with and is a bit underwhelming to say the least. Her healing doesn't scale much with any of the things she builds and she is too squishy to be deemed sustainable. While her passive increases certian statuses like life steal, range and crit for example, her attack speed (including crit damage) is clutched and fails to reach normal scaling. If she is not meant to be a marksmen and fails to work like a healing support then maybe she's an ability caster? Well maybe not. If anyone has played Senna within URF you will realize that her q still takes a little more than a second to use at level 1, but can still poke pretty far. In contrast to Lucian, Senna is just gross ranged champion at this point. If Senna's q scaled better when it came to healing compared to damage and her e wasn't wholeheartedly useless, then maybe we would be in buisness.
Sorry for what seems like a rant. Thanks for reading. I'm awaiting your response.