Mordekaiser Showings:
Note that the following is mostly game mechanics, as Mordekaiser doesn't have many 'cutscene' showings yet:
-Mordekaiser is the single most powerful nuker in League of Legends if he gets into somebody's face. Due to a quirk in the way the engine works, with the right item Mordekaiser's fastest-recharging spell has a ratio of Ability Power (magic ability in other words) that outstrips even Ultimates, powerful spells that almost always have a cooldown of a minute or more in a game that usually lasts 30 minutes. Said spell, with appropriate items, recharges every two seconds and a half, and it's important to note that the power of a League of Legends Champion in a summoning match is always just a shade of their actual abilities - another champion is an unstoppable force that is completely immune to anything but magic powerful enough to devastate whole continents for instance.
-Going into melee with him is suicide. Not only does the aforementioned spell have the ability to leave Ryu very hurt or dead outright with one blow, but another trick up Mordekaiser's sleeve is his ability to create a tornado of metal that swirls around him. This blade barrier has the second highest base damage of all abilities in the game and scales super heavily with items (and it, too, hits as hard or harder than most Ultimates if an enemy bears the full brunt of it, from the get-go). It also amplifies his ability to resist damage.
-If Ryu tries to stay at range, Mordekaiser has the ability to inflict him with deadly disease from afar (or flat-out sap his life, take your pick). He just has to lift a hand and boom, Ryu is hurt. No way to dodge besides not being in range.
-The curse is not to be underestimated. With only its base values, it leeches off a third of an enemy's health, guaranteed, no questions asked, and gives it to Mordekaiser. Half of it is a burst heal, the other half happens over ten seconds. It also scales fast with AP.
-And lastly, Mordekaiser has his shield. Every attack he lands empowers him: A part of the damage he deals is converted into a potent shield that protects him from damage. He's already an animated suit of armor, so killing him isn't easy, but on top of that the more this fight drags the more dangerous he'll get.
Timestamping Ryu vids. Unless someone beats me to the punch they'll come in a short while.
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Currently playing: League of Legends, Chrono Cross.
Current Projects: Fool's Overture, CYOA: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60143513