Board Thread:Suggestion and Critics/@comment-2152536-20140127091918/@comment-11148831-20140127120654

The mark on the card is the official signature for the character. Weiss Schwarz is releasing character signed cards like that one. Niko's name in her signature is also spelled as Nico.

SIF's release of cards also spell Eri as Eli and Niko as Nico.

I think 絵里 is romanized as Eri because Japanese don't use "L" in speaking, and にこ as Niko since "C" and "K" sound the same. When I type Japanese characters, and I used "C" instead of "K", it produces the same character.

Though, of course, everything's just the same.