Fun Fact: Wicke is the German word for "vetch", a fern-like plant that is toxic if eaten in large quantities, leading to it being used as a "last resort crop". Who knows, that might hint at something...
Faba comes from faba beans, which explains the shape and color of his signature glasses. Faba beans, though typically edible, should be avoided by though on anti-depressants, as the chemical interaction between those two ingested substances can lead to your red blood cells breaking down, causing severe anemia.
And Lusamine is a flower. Her name comes from the Impatiens balsamina to be exact, better known as the garden balsam or touch-me-not. This flowering plant is used as something of a cure-all, serving as a traditional treatment for everything from rheumatism to snake bites. It also contains a chemical that is the key ingredient in sunless tanner, making her paleness a bit of hilarious irony. If you're wondering why they're called touch-me-nots, that because touching the matured seed pod of one of these plants will result in it explosively dispensing its seeds. This, in conjunction with them being poisonous if ingested incorrectly, give these plants just as much potential to harm as they do to help.
Similarly, Gladion's name comes from the genus Gladiolus. Species under this genus are sometimes referred to as "sword lillies", as it is derived from "gladius", meaning "sword". It is the birth flower of the month of August and it represents honor, faithfulness, and strength of character. It also has a Greek legend attached to it:
"Two brothers fell madly in love with the same young woman. Neither one would back down, with each believing they deserved her more. Their brotherly love gave way to intense hatred until it reached a point where they vowed to fight each other to the death. The battle raged, with furious clashes of steel echoing through the air, until both brothers fell due to their fatal wounds. In their final moments, they plunged their swords into the ground. According to the legend, from that very spot grew the first two gladiolus plants, with leaves like little swords and blood red flowers marked in their hearts with white splashes from the tears of the young woman who unwittingly and unwantedly caused their demises."