Dean and Cole (summer love) (MAO)
(Dean)

Personality: dean isn't a big fan of summer but he still ended up getting dragged to the beach
Event ability: summer love (his power is doubled when he's on the beach, he can perform a joint grand magic with any other servant that has summer love)
Grand magic: seasonal flower viewing
Joint grand magic: love blossoms
Hidden abilities: earth power
High horsepower (he has stronger physical attacks than just about any other servant
Characteristics: French, human, magician, summer, MAO, event
Class: warrior
Rank: EX
Weapons: none
Rank explanation: what's this?! A version of dean with an EX rating?! This version of dean earns that rating because of his joint grand magic love blossoms which does massive damage to the enemy while also increasing the defense of the caster while healing the casters entire team, pretty potent stuff, other than that he's just a basic martial arts warrior and really isn't anything special, his default grand magic buffs his defense and heals him
(Cole)

Appearance note: his skin is far more tan since he's supposed to be Hispanic but it was hard enough finding regular pictures let alone ones for a Hispanic
Personality: Cole loves summer and the beach which is why he dragged dean along
Event ability: summer love
Hidden abilities: water power (gets his power increased when around water)
Blessed water rank: EX
Weapons: squirt gun
Class: archer
Characteristics: human, magician, Puerto Rican, summer, Event
Rank: EX
Grand magic: water gun warfare
Joint grand magic: love blossoms
Rank explanation: overall he's a just decent servant when he's not literally on the beach but his joint grand magic once again helps him snag the EX rank, his default grand magic does damage to the opponent via a series of high pressure water jets

Maria black (summer showing)

Personality: Maria decided to hold her puppet show at the beach to make some extra cash
Event ability: summer showing (power is doubled on the beach, she can absorb mana from her opponent every time they are hit by one of her puppets)
Weapons: puppet closet
Hidden abilities: summer strings (she can control 2 puppets at a time using magical strings)
Fortress (her defense is doubled when standing still)
Grand magic: final performance of summer
Rank: B
Characteristics: American, event, summer, human, magician
Class: caster
Rank explanation: she has one major issue in the fact that she has to stay still to get the most out of her abilities but that also makes her a wide open target for opponents faster than her puppets, her grand magic does a nice amount of damage while also buffing her team

Sophia von sweet (summer sweets) (MAO)

Personality: Sophia seems more quiet on her trip to the beach
Event ability: summer sweets (double power when on the beach, gains mana when eating anything sweet, doubles defense magic power after taking damage for a short time)
Hidden abilities: guardian (doubles defense magic when around multiple people)
Order of the shield (defense magic is doubled and defenses are tripled, this ability can not be copied, attack is halfed)
Grand magic: summer guardian
Rank: EX
Characteristics: German, human, magician, summer, event
Weapons: summer shield
Class: warrior
Rank explanation: the first servant to have a truly great defensive move set, she can pretty much negate any damage coming to her or her teammates but she isn't going to be dealing any damage any time soon and she has no form of utility

Aster shards (summer miracles)

Personality: no one knows why water bleached his hair but he did and this was the result
Event ability: summer miracles (power is doubled on the beach, healing magic is doubled)
Class: caster
Weapons: none
Hidden abilities: selfish summer (healing magic is doubled when used on himself and halves when he uses it on others)
Blessed water EX
Rank: EX
Characteristics: American, human, magician, event, summer
Grand magic: shooting star
Rank explanation: aster is a caster who's going to stay in a fight for a very long time making him capable of taking on opponents like Nero alter who expend their mana within the first few minutes of a fights, his damage isn't anything special but he's not bad either