Overview
Marcel is a member of the Paxley family along with Aamon and Gusion, his role is a support that excels on crowd control while also the first hero to introduce a new type of crowd control in the game.
Strengths
Marcel's ability to stop any enemy hero that's within his range is what makes him scary in teamfights and that's because of his passive "Platinum Snap". It can be triggered whenever an enemy hero is near Marcel and it cannot be stopped, not even a cc immunity skill or purify can stop Marcel's passive. Marcel shines the most when it comes to turlte and lord fights. Especially with his overwhelming ultimate to stop time on a large amount of area. It's ability to disrupt the enemeis positioning is what makes him an incredible roamer.
Weaknesses
Despite Marcel's strength there are also flaws and one of them is that Marcel can't gain any Extra Hp. he's incredibly weak agaisnt heroes like Lesley. The lack of tankiness he has is his flaw to balance out his cc. Marcel also needs specific heroes to make his ult shine and if that requirement is not met, his ult is either useless or a friendly fire for the team.
Tank Emblem Marcel
This build is for Marcel when he uses the Tank Emblem set. His Core item is going to be Thunderbelt because of his passive ability to trigger attack effects just by going near an enemy. Oracle for his Shield and CD Reduction and Guardian Helmet to reduce the Burst Damage inflicted to Marcel.
Support Emblem Marcel
As for this build, it is recommended when you're using support emblem for Marcel. Thunderbelt as his first core item, Flask of the Oasis to fully utilize his ability to give shield to his teammate. Oracle and Guardian Helmet for sustain and to reduce the incoming burst to Marcel.
Tank Emblem
Tank emblem to gain alot of Physical and Magic Damage for his passive and early game, Agility and Wilderness Blessing for quick rotation and Quantum Charge for extra mobility when there's a clash
Support Emlbem
Support Emblem if you're planning to use Flask of the Oasis, same emblem talents as before except for tenacity. Tenacity is used to balance out his tankiness
Battle Spell
Using flicker for Marcel is never going to be a bad decision. It's very good for his ultimate to close the distance and startle the enemy backline.
Early Game
Lay low and keep abusing his passive in the early until you reach level four.
Mid Game
Focus on stunning the enemy jungler or their play maker when it comes to turtle fights.
Late Game
Focus on stunning the enemy backline so they wont have a free hitter.
Best With Chang'e
Both Marcel and Chang'es ultimate is like bread and butter. They can absolutely annihilate whoever is in Marcel's Ulti, with Chang'es help.
Watch Out For Lesley
With Lesley's True Damage burst and Marcel's flaw of not getting any extra hp on items. She's the perfect counter for Marcel.