Covert Pervert: Turns out that she really likes butts. (Or at least coconuts shaped like butts.)
The Ditz: She has a few moments. So far, she seems to be the spaciest of all the female characters, especially in the Christmas events, where she has texted Finland just to ask how he would describe ants being all over the place and tries to play in the snow as if it were sand.
Seychelles: Ah, can I eat the fish? It's a fresh fish. [...] Or would a flying fish be better? Is it?
Joshikousei: She's the star of Gakuen Hetalia, as already mentioned.
Large Ham: She tends to be a bit over-dramatic sometimes. Her reaction to being told that her place would be the honeymoon destination for Will and Kate is a good example of this.
New Transfer Student: In the Gakuen Hetalia game, France convinces her to join the World Academy. When she draws her national crest on the chalkboard, the other members of her Africa Class laugh so hard at how cheesy it is they need to be taken to the school infirmary.
Only Sane Man: Averted. In Gakuen Hetalia, Seychelles attempts to put a curse on England, only to have him reveal himself as a lover of black magic as he starts begging for her to teach him. This causes Seychelles to think on how strange everyone in World Academy W is, not realizing that she is in fact just as weird as everyone else.
Seychelles: I'll say my name and everything straight up when I prank call England. I'll pretend to talk about the TV instruction manual with him.
Sassy Black Woman: The more positive side of this trope. She occasionally says snarky things about her (at the time) boss England as well, and is said to have dumped France in Christmas. Look below as well.
Shorttank: Seems to be getting this treatment in a few sketches as of late.
The Slacker: Despite her energetictendencies, Seychelles is described as being sloppy and a bit lazy. This shows up during the Christmas events where she puts off cleaning and is portrayed as being very carefree.
Sempai Kohai: Implied to be the nature of their relationship, as Monaco refers to Seychelles with the suffix "-kun", something often used by seniors referring to their kohai. Fandom often portrays them in this sort of relationship, or Monaco as Seychelles' Cool Big Sis.
Tsundere: In Gakuen Hetalia, she's a Type B that goes from demure and polite to screaming or swearing as soon as England or France push her too far, either by being bossy (England) or by groping her (France).
In the original Gakuen Hetalia script, one of the "bad endings" (the one where she joins the Axis) drives it very straight to the point, as it finished with Seychelles screaming and swearing that she'll kill England the next time they meet.
To England (After he clamps a dog collar on her and declares her his colony): LIKE HELL I WILL YOU EYEBROW BASTAAARD!