STATS

Age: 19
Height: 157cm/5'2"
Weight: 50kg/110lbs
Eyes: Dark green
Hair: Green-black? WHO EVEN KNOWS. ANIME...!
Appearance: Short, skinny, pale, not much in the way of muscle mass. No distinguishing anything at all to speak of. His ethnicity is never really even vaguely alluded to, so I won't ask if you don't. Supposedly British, but his hometown is also similarly never mentioned, so who the fuck even knows what accent he has because lol Japanese canon. You're welcome to recognise it as "British" but, again, LET'S NOT TAKE IT ANY FURTHER THAN THAT...

POWERS

Description of powers: oh god. HE'S A MAGE.............??? whatever he's weaksauce and can't do much of anything anyway. Mostly small-time things: manipulation of magical energy, summoning spirits, controlling small animals as familiars, memory spells, alchemy... though man we don't even know what all of "alchemy" includes so IDK IDK Fate/canon is hopelessly vague wrt this stuff :\
Strength/Extent of powers: see... above...
Memory related: You betcha
Relation to memory: Totally had EXTENSIVE LEARNING to be a mage and he's still not very good so um you can bet he will be hopelessly useless for a good long time.
Effect of the powercap: LMAO WAVER... DOESN'T NEED... A POWERCAP... 8Db