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I can really only answer for Soul Eater as I have not watched Negima yet. The Aria's (or mantra) used by the witches are themed on their powers and the animal/object they are themed around.

For Blair, even though she's "a cat with a ridiculous amount of magic", her attacks are themed around Halloween and pumpkins are a symbol of Halloween.

For Medusa, her theme is Snakes, so when she says "Nake snake cobra cobubra", it's a reference to snakes ("Nake" and "cobubra" may be deliberate misspellings of Snake and cobra), and her Vector Magic seems to resemble snakes in how they move.

For the Mizune sisters, even when combined, we don't see any Aria used. However, their signature phrase "Chi Chi Chi" could be taken as their aria, since "Chi" is described as the sound of a mouse squeak on the Wikia page

I would assume the basis mangaka's use for witch incantations and the like would come from Mantras. sometimes they are called Arias or incantations but the basic principle is that the words that make them up hold value either to the actual spell or to the user.

In Soul Eater the witches use Arias which flow from their themes. For Blair, even though she's "a cat with a ridiculous amount of magic", her attacks are themed around Halloween and pumpkins are a symbol of Halloween eg. "Pumpkin Pumpkin, Halloween Cannon!".

For Medusa, her theme is Snakes, so when she says "Nake snake cobra cobubra", it's a reference to snakes ("Nake" and "cobubra" may be deliberate misspellings of Snake and cobra), and her Vector Magic seems to resemble snakes in how they move.

I haven't seen Negima however from nhahtdh's comment it would work out the same since the words "feels comfortable and natural to the user" the words would have a psychological effect on the caster. so most likely a new mage will have weaker/unstable spells in the beginning but as they practice they build up an Aria which will make them feel conformable.

I can really only answer for Soul Eater as i have not watched Negima yet, the Aria's (or mantra) used by the witches are themed on their powers and the animal/object they are themed around, with Blair, even though she's "a cat with a ridiculous amount of magic" her attacks are themed around Hallowween and pumpkins are a symbol of Halloween.

With Medusa, her theme is Snakes so when she says "Nake snake cobra cobubra" its a refernce to snakes (Nake and cobubra may be deliberate misspellings of Snake and cobra) while her Vector Magic seems to resemble snakes in how they move.

with the Mizune sisters, even when combined we don't see any Aria used their signature phrase "Chi Chi Chi" could be taken their aria as "Chi" is described as the sound of a mouse squeak on the Wikia page

I can really only answer for Soul Eater as I have not watched Negima yet. The Aria's (or mantra) used by the witches are themed on their powers and the animal/object they are themed around.

For Blair, even though she's "a cat with a ridiculous amount of magic", her attacks are themed around Halloween and pumpkins are a symbol of Halloween.

For Medusa, her theme is Snakes, so when she says "Nake snake cobra cobubra", it's a reference to snakes ("Nake" and "cobubra" may be deliberate misspellings of Snake and cobra), and her Vector Magic seems to resemble snakes in how they move.

For the Mizune sisters, even when combined, we don't see any Aria used. However, their signature phrase "Chi Chi Chi" could be taken as their aria, since "Chi" is described as the sound of a mouse squeak on the Wikia page

I can really only answer for Soul Eater as i have not watched Negima yet, the Aria's (or mantra) used by the witches are themed on their powers and the animal/object they are themed around, with Blair, even though she's "a cat with a ridiculous amount of magic" her attacks are themed around Hallowween and pumpkins are a symbol of Halloween.

With Medusa, her theme is Snakes so when she says "Nake snake cobra cobubra" its a refernce to snakes (Nake and cobubra may be deliberate misspellings of Snake and cobra) while her Vector Magic seems to resemble thanks in how they move.

with the Mizune sisters, even when combined we don't see any Aria used however their signitrue phrase "Chi Chi Chi" could be taken their aria as "Chi" is desribed as the sound of a mouse squeak on the Wikia page

I can really only answer for Soul Eater as i have not watched Negima yet, the Aria's (or mantra) used by the witches are themed on their powers and the animal/object they are themed around, with Blair, even though she's "a cat with a ridiculous amount of magic" her attacks are themed around Hallowween and pumpkins are a symbol of Halloween.

With Medusa, her theme is Snakes so when she says "Nake snake cobra cobubra" its a refernce to snakes (Nake and cobubra may be deliberate misspellings of Snake and cobra) while her Vector Magic seems to resemble snakes in how they move.

with the Mizune sisters, even when combined we don't see any Aria used their signature phrase "Chi Chi Chi" could be taken their aria as "Chi" is described as the sound of a mouse squeak on the Wikia page