Fangirl, ok. That's good to know.
Actually Fire Emblem are one of the harder (if not the hardest) franchises to implement:
1) Unlike most mascots, FE chars are RPG characters. In RPG, you have a weak character becoming a god near the end of the game, with not only physical changes but stats changes. Most mascots are anachronic: Mario, Kirby, Link, Pikachu, Dedede, Bowser, Ice Climbers... are characters that don't change drastically, they are always the same since they are not only Nintendo but videogame classics, so it's very easy to pick moves for them. That doesn't apply to FE characters. FE characters go through many stages during the games, so that's a problem when picking a character, "should we go with young Ike, general Ike, vangard Ike?". Each one have different traits.
2) FE is a ****ing pain to draw moves from. It isn't a fighting game although fighting is part of the game, and the characters have around 2 moves, 4 if they promote. Marth didn't have any move from the games. Ike has 2 moves because they are recognizable from the games and actually viable for Smash.
3) Smash characters aren't canon. Brawl Zelda isn't TP Zelda. Brawl Mario isn't Galaxy Mario. They mix moves and looks from many games, even with redesigns. Is Ike from Path of Radiance? If he is from Path of Radiance... could you know from which part of the game is Ike? It could be level 5 Ike with Ragnell and that would explain why he is so slow. Or not. Smash characters are anachronical. Sakurai looks for available characters and works a certain role in the roster for them.
4) Since characters can't be copy-pasted from their games, that's a problem. I think Metroid fans were deceived when they saw how slow was Samus in SSB64, and how fast she was in Super Metroid. She couldn't aim diagonal, she couldn't space jump forever, she even keeps shooting the grapple beam from the arn cannon which is contradictory with the games, and uses flames which she never used. But even then, that character in that fighting game felt like Samus, but in a whole different enviroment.
Actually Ike in Brawl present many traits from the original. He was strong and bold, both physical and mentally (with powerful moves). He also was persistent, single minded, always fought back (super armor frames). His style was barbaric and unpolished (Æther, powerful moves that leave him wide open), and that stood even more than the stats. He wields a heck of a blade, which is very heavy (the games state it weights 20, almost the double of Ike's weight), so it's natural, realistic, at least in the "neutral" and unbiased space of Smash Bros., to move like a normal human with a ****ity heavy sword. The first thing you see about Ike is that he is no normal lord, and that was one of the reason for why he is so popular. Even more than being "fast", but rather a mixture of bold personality, great development and efficient battle-wise. At least, for me.
Sakurai doesn't look the stat caps and the grow rates. That's irrelevant to Smash Bros. Ike's qualities are obvious at first glance.
But I guess everybody is entitled to their opinion. Ike doesn't need blue glows and sounds to be awesome, that would be even annoying.