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As much I like the ship, I don't think they would success as two leaders. 1) Because that is not Jayce interest nor is something he is good at. 2) Mel is cunning and manipulative with her power, she would end up using Jayce (as she canonly did) even without wanting to.
I would like people to stop seeing them as "hot straight couple" or "straight power couple", those are nice tropes but are rather meaningless for these two.
Try having Mel learn to love without feeling the need to hold power over the other (unlearn the toxic love she learned with Ambessa). Have Jayce learn to follow more what he actually wants to do instead of what "he has to", for whatever reason. Have them look for each other to have a safe place from the responsibilities and expectations they both have, let them just love and support each other like they clearly wanted even if they were just learning how to do it.ðŸ˜
At least they were hot as hell and beautiful in those outfits (both in black). Perhaps in another life they had a passionate emotional reunion. Ah I would dream to see my sweet power couple as Leaders of Piltover!