I've rolled Dantes (twice, but I only have the account I just rolled him in nowadays; not the one with level-90 bond 6 dante). I know his bond lines. [url=https://fategrandorder.fandom.com/wiki/Sub:Edmond_Dant%C3%A8s/Dialogue]They're also here.[/url] The rest of the bond-locked info is clearly revealed at the bottom of the page in the wiki, so it's not like any of his profile is in doubt. He firmly insists he's not Edmond Dantes. The rest is that he goes on a rant in his event, if you recall. 

Either way his luck is nonexistent. That he has a skill that merely gives luck is a pretty damning indictment of his luck.

"I can speed up from C rank Agility to fast but not do more than that unless I go all out, at the cost of mana!" places him squarely with... Okita. Okita has a literal speed teleportation ability. One, that's not broken; and two, Dantes' is an NP so it's activated to some degree and burns mana. And it's a [i]Noble Phantasm,[/i] not a skill, which is extra bad for our edgy friend here, because it IS a giveaway.

There is no reason to believe he has infinite mana--both based on his given sources and crappy rank of Self-Replenishment. So it's a finite speed buff that will quickly and rapidly degrade his fighting ability, because his combat style is entirely based upon spamming magical attacks as he has neither a weapon, nor armour, nor experience fighting legendary warriors.