7 Flowers for each Riordanverse character based on flower language.

Strap in, this is gonna be a long one.

Percy Jackson:

1. Apple Blossom: Preference. Fate speaks him great and good
2. Blue-Flowered Greek Valerian: Rupture
3. Camomile: Energy in Adversity
4. Hawkweed: Quick-Sightedness
5. Larch: Audacity. Boldness
6. Mistletoe: I Surmount Difficulties
7. Southernwood: Jest, Bantering

Annabeth Chase:

1. Azalea: Temperance
2. Canterbury Bell: Acknowledgement
3. Cloves: Dignity
4. Hundred-Leaved Rose: Pride
5. Indian Lagerstroemia: Eloquence
6. Red Catchfly: Youthful love
7. Walnut: Intellect, Stratagem

Grover Underwood:

1. Bearded Crepis: Protection
2. Bluebell: Constancy
3. Cactus: Warmth
4. Convolvulus: Bonds
5. Larkspur: Lightness, Levity
6. Magnolia: Love of Nature
7. Water Lily: Purity of Heart

Jason Grace:

1. Blue Violet: Faithfulness
2. Broom: Humility. Neatness
3. Fennel: Worthy all praise, Strength
4. Garden Marigold: Uneasiness
5. Mint: Virtue
6. Sycamore: Curiosity
7. Woodbine: Fraternal Love

Leo Valdez:

1. Chinese Chrysanthemum: Cheerfulness under Adversity
2. Fern: Fascination
3. Fleur-de-lis: Flame. I Burn
4. Penciled Geranium: Ingenuity
5. Peppermint: Warmth of Feeling
6. Thyme: Activity
7. Yellow Balsam: Impatience

Piper McLean:

1. Acalia: Temperance
2. Amaryllis: Pride, Timidity, Splendid beauty
3. Cabbage Rose: Ambassador of Love
4. Coreopsis Arkansa: Love at first sight
5. Holly: Foresight
6. White Dittany of Crete: Passion
7. White Mullein: Good Nature

Frank Zhang:

1. Canary Grass: Perseverance
2. Christmas Rose: Relieve my Anxiety
3. Coriander: Hidden worth
4. French Willow: Bravery and Humanity
5. Milfoil: War
6. Small White Bell Flower: Gratitude
7. Sweet Violet: Modesty

Hazel Levesque:

1. Aconite-leaved Crowfoot: Luster
2. Balm of Gilead: Cure. Relief
3. Flowering Almond: Hope
4. Holly Herb: Enchantment
5. Lote Tree: Concord
6. Lucerne: Life
7. Sweet Basil: Good Wishes

Reyna Ramirez-Arellano:

1. Ash-leaved Trumpet Flower: Separation
2. Barberry Tree: Sharpness
3. Branch of Thorns: Severity. Rigor
4. Goat’s Rue: Reason
5. Quamoclit: Busybody
6. Striped Carnation: Refusal
7. White Oak: Independence

Nico di Angelo:

1. Amethyst: Admiration
2. Lavender: Distrust
3. Milkwort: Hermitage
4. Oleander: Beware
5. Red Balsam: Touch me not. Impatient resolves
6. Weeping Willow: Mourning
7. Yellow Acacia: Secret Love

Rachel Dare:

1. Auricula: Painting
2. Beech Tree: Prosperity
3. Dandelion: Rustic Oracle
4. Gooseberry: Anticipation
5. Purple Clover: Provident
6. Ragged Robin: Wit
7. Scotch Fir: Elevation

Chiron:

1. American Starwort: Welcome to a stranger. Cheerfulness in old age
2. Buckbean: Calm repose
3. Flowering Reed: Confidence in Heaven
4. Goldenrod: Precaution
5. Marsh Mallow: Beneficence
6. Olive: Peace
7. Rhubarb: Advice

Apollo:

Before ToA

1. Bundle of Reeds with their Panacles: Music
2. Glory Flower: Glorious Beauty
3. Love Lies Bleeding: Hopeless, not Heartless
4. Nightshade: Truth
5. Prophetic Marigold: Prediction
6. Scarlet Poppy: Fantastic Extravagance
7. Sweetbrier: Poetry, I wound to heal

After ToA:

1. Agrimony: Thankfulness. Gratitude
2. Everlasting: Never-Ceasing Remembrance
3. Flos Adonis: Painful Recollections
4. Lotus Leaf: Recantation
5. Moschatel: Weakness
6. Scarlet Lychnis: Sunbeaming Eyes
7. Small Bindweed: Humility

Meg McCaffrey:

1. Borage: Bluntness
2. Burdock: Importunity, Touch me not.
3. Dogwood: Durability
4. Mouse-Eared Chickweed: Ingenious Simplicity
5. Mushroom: Suspicion
6. Oak-Leaved Geranium: True Friendship
7. Thornless Rose: Early Attachment

Luke Castellan:

1. Aloe: Grief, Religious superstition, Affection
2. Begonia: Beware
3. Belvedere: I declare against you
4. Dark Geranium: Melancholy
5. Quaking Grass: Agitation
6. Raspberry: Remorse
7. Thorn Apple: Deceitful Charms

Octavian:

1. Abatina: Fickleness
2. Buttercup: Ingratitude. Childishness
3. Citron: Ill-Natured Beauty
4. Dahlia: Instability
5. Madder: Calumny
6. Tall Sunflower: Haughtiness
7. Wild Geranium: Steadfast Piety

Calypso:

1. Cornel Tree: Duration
2. Crowsbill: Envy
3. Garden Anemone: Forsaken
4. Lotus Flower: Estranged Love
5. Vervain: Enchantment
6. White Camellia Japonica: Perfected Loveliness
7. White Clover: Think of me

Thalia Grace:

1. Arbor Vitae: Unchanging friendship. Live for me
2. Checkered Fritillary: Persecution
3. Elder: Zealousness
4. Purple Columbine: Resolve to win
5. Sainfoin: Agitation
6. Yellow Carnation: Disdain
7. Zephyr flower: Sickness, Expectation

Will Solace:

1. Allspice: Compassion
2. Ambrosia: Love returned
3. Cowslip: Pensiveness. Winning Grace
4. Honeysuckle: Generous and Devoted Affection
5. Oak Tree: Hospitality
6. Spearmint: Warmth of Sentiment
7. Wild Grape: Charity

Lityerses:

1. Bay Leaf: I change but in death
2. Birdsfoot Trefoil: Revenge
3. Box Tree: Stoicism
4. Columbine: Folly
5. Hazel: Reconciliation
6. Mountain Laurel: Ambition
7. Tremella Nestoc: Resistance

Nero:

1. Beech Orchis: Industry
2. Cabbage: Profit
3. Passion Flower: Religious Superstition
4. Pidgeon’s Berry: Indifference
5. Polyanthus: Pride of Riches
6. Scarlet Auricula: Avarice
7. Wolfsbane: Misanthropy

Commodus:

1. American Cowslip: Divine beauty
2. Centaury Bluebottle: Delicacy
3. Chestnut Tree: Do me Justice, Luxury
4. Crown Imperial: Majesty, Power
5. Hydrangea: A Boaster. Heartless 
6. Laurel: Glory
7. Narcissus: Egotism

Caligula:

1. Agnus Castus: Coldness, Indifference
2. Bilberry: Treachery
3. Hop: Injustice
4. Lobelia: Malevolence
5. Parsley: Festivity
6. Purple Larkspur: Haughtiness
7. Rue: Disdain