While these are not Hiro's first debut in the card game, they are certainly some of his most impressive, both in terms of artwork and strategic abilities when brought to the table, including the new dual-ink mechanic
However, if the effect of "Formula Synchron" is activated at Chain Link 2+, then the Synchro Summon is performed in the middle of resolving a Chain
Incapsula incident ID: 1849000640900982739-1120110235214221372
It cannot be used as a Synchro Material Monster during the turn it is Special Summoned by this effect.
For me, Belle is actually one of my favorite cards from The First Chapter from a playability standpoint at well, with two fantastic abilities
Control decks can use this to buy a lot of time against a single creature (since blue has no common hard removal) and aggro decks could set up big turns where they lock down two blockers out of nowhere