Peter colorburst and Simon hang (summer camp paintings)
(Peter)

Personality: Peters teaching painting to Simon and a bunch of kids it's actually a pretty good fit for him
Class: caster
Event ability: summer camp paintings (increased power when at summer camp, increased power when near a painting, can perform a joint grand magic with anyone else who has the summer camp painting ability)
Hidden abilities: rainbow (can let paint out of his body)
Hands of fate (he can make small alterations to an opposing servants stats)
Grand magic: rainbow colored magic
Joint grand magic: a painting of you and me
Weapons: paint brush
Class: caster
Characteristics: American, human, magician, male, event, summer camp
Rank: A
Rank explanation: a caster with great field control and some strong offensive options but with a great many weaknesses, his grand magic deals a lot of damage and his joint grand magic does a great deal of damage

(Simon)

Personality: simon's hair got turned white in a painting accident, he's not very good at painting but peter's trying to teach him
Event ability: summer camp painting
Hidden abilities: hypnosis (can brainwash his opponents in a variety of ways)
Hands of time (can slow down time temporarily once every 24 hours)
Weapons: paint brush
Class: caster
Grand magic: messy canvas
Joint grand magic: a painting of me and you
Characteristics: male, magician, human, American, event, summer camp
Rank: A
Rank explanation: a solid defensive servant that isn't too great but isn't a bad option either, his grand magic does a decent amount of damage

Mary wings (secluded summer)

Personality: Mary just wants to enjoy her summer alone while reading a good book
Event ability: secluded summer (increased power when in a summer camp setting, increased power when fighting alone)
Hidden ability: perfect quiet (doubles attack and defense when fighting alone)
The library is open (she can learn any magic that she sees or reads about)
Class: caster
Weapons: none
Grand magic: summer wings
Characteristics: angel, female, British, magician, event, summer camp
Rank: EX
Rank explanation: she excels at being a servant that fights alone and can be far more useful than almost any servant as lone as she's not being supported, she can also develop a wide array of spells, her grand magic is a healing grand magic that also does a little bit of damage

Abigail burn (summer camp training)

Personality: Abigail is directing the sports section of the summer camp this year
Class: warrior
Weapons: summer spear
Event ability: summer camp training (doubles power when in a summer camp setting, power increases as a fight continues)
Hidden abilities: blue butterfly (she can draw mana from her surroundings and can temporarily fly)
The dawn is quietly blazing (gains power as a fight goes on)
Grand magic: summer streak
Characteristics: American, female, human, magician, event, summer camp
Rank: EX
Rank explanation: Abigail loves to take a beating in the beginning of a fight before turning around and destroying her opponent with the combination of 2 abilities that increase her power as a fight goes on and a grand magic that deals more damage the more damage Abigail has taken, making a great pick for a warrior who is going to be working alongside a strong support servant

Takemi bloom (summer camp cooking)

Personality: takemi is learning how to cook over the summer
Event ability: summer camp cooking (doubles power when at a summer camp, she can imbue food with special properties)
Hidden abilities: boiling blood
Sharp body (she is more flexible than a normal person and faster, she can turn parts of her body into sharp blade like appendages)
Weapons: kitchen knife, frying pan
Class: warrior-caster
Grand magic: dinner is served!
Characteristics: Japanese, female, human, magician, event, summer camp
Rank: EX+
Rank explanation: it doesn't get much better than takemi's servant form, she has a strong grand magic that buffs her entire team up and heals them up, she can hold her own in a fight with a collection of abilities to keep her from taking damage while also dishing quite a bit of damage out and overall is just a very well rounded servant who has a slight specialization in support