Mona wings (rainbow) (MAO)

Personality: a younger form of Mona from back when her family wasn't dead, she's a talented violinist and is general a quite happy person something which her other servant forms tend to have in common
Weapons: crystal violin
Hidden abilities: rainbow colored crystal (she gains more power the more Mona servants you have)
Muse (she powers up other caster class servants around her)
Class: caster
Grand magic: crystal finale rainbow
Characteristics: dragon, human, MAO, great hero, huntress, magician
Rank: C~EX
Rank explanation: depending on the amount of Mona servants you have she can go from a decent servant to a powerhouse of a servant, her grand magic is a standard high power attack grand magic.

Mona wings (blue) (MAO)

Personality: this version of Mona is even younger and more childlike, she's a talented dancer
Class: caster
Hidden abilities: magical girl of sapphire (she can power herself up into an even more powerful form but she needs more mana from her master to do it)
Floater
Grand magic: crystal finale sapphire
Weapons: sapphire purse
Characteristics: human, dragon, MAO, great hero, huntress, magician
Rank: EX
Rank explanation: she's a high risk high reward servant like Nero alter she has to close out a match quickly to really be good, but when she's good she's really good, her grand magic does increased damage against warriors

Mona wings (red) (MAO)

Personality: in the closest thing Mona will get to a Valentine's Day event form, she takes the form of her teenage self who was in love with a boy that would later die in a fatal accident
Class: caster
Hidden Abilities: magical girl of ruby (same as magical girl of sapphire)
Apples and apples (she can copy the stats of the servant she is going against)
Grand magic: crystal finale ruby
Characteristics: same as the other
Weapons: none
Rank: A
Rank explanation: she's a defensive support caster and she's outclassed in both, she doesn't have the defensive abilities of shazuya and is outclassed by the support of Abby (heart shaped chocolate) and her kind, her grand magic increased the defense of all party members

Mona wings (yellow) (MAO)

Personality: a version of mona from when she was going through her pop phase
Weapons: electric guitar
Class: caster
Grand magic: crystal finale topaz
Hidden abilities: magical girl of topaz (she can quadruple her defense at the cost of eating up twice the mana)
Magic absorption A (she can absorb most of the damage and mana from magical attacks ((includes grand Magic's)))
Characteristics: same as the others
Rank: EX
Rank explanation: she's the perfect anti-caster caster which is a niche that can only be claimed by few, she has the ability to increase her defenses to that of the top tier defense servants like Napoleon so attacks aren't really gonna harm her the downside is a weaker attack but thanks to magic absorption any magic used against her will be all but negated and she'll be able to keep fighting longer

Mona wings (orange) (MAO)

Personality: a preteen version of Mona she is mischievous and devilish but overall still nice
Weapons: devils drums
Hidden abilities: magical girl of citrine (same as sapphire and ruby)
Little devil (deals double damage against servants who are 'good')
Characteristics: nothing new to see here
Grand magic: crystal final citrine
Weapon: devils drum kit of citrine
Rank: A
Rank explanation: she's an anti-good servant which is a niche that is pretty useful due to the massive amount of 'good' servants in fact with the exception of Abigail all 4 of the other available starting servants are 'good' and most of the better servants are 'good', her grand magic deals very little damage but can hit a lot of enemies making it useful when your going up servants like Jack the Ripper (assassin and caster) or tamano-no-Mae

Mona wings (green) (MAO)

Personality: a version of Mona that is shy and doesn't like to talk to anyone, she is sweet and loves nature in her current state, she is older than blue but younger than orange
Weapons: fairy's harp
Hidden abilities: magical girl of peridot (doubles her attack and speed at the cost of double mana)
Fairy moon (her magic is doubled under the moon)
Class: caster
Characteristics: same as always
Grand magic: crystal finish: peridot
Rank: A
Rank explanation: she's situational and double attack and speed isn't as good as it sounds as double power and quadruple defense both provide much better benefits at the same double mana cost, her second hidden ability can make her stronger when used with her first one but there are better servant to use when there is a moon in play, her grand magic crystal finisher peridot allows her to stun her enemies by encasing them in crystal while also doing some damage