Some of these things have been tsated above, but I’ll add a little to it, and throw in an example of my old, but since retried, RP main.
Gimmicky & Questionable items can be very hit or miss. If you make something that is very lore-breaking, it can feel equally immersion breaking. If you make something OP, it’ll likely deter interest, becase it seems gimmicky and unfair. When done right though, it can be a fun and creative addition to RP for sure.
For my own example, many years back on the server “Earthen Ring,” When it was still a thriving RP community, I had a cat RP character - Yes, I know it’s seen as cringe, and it was indeed rather cringe the first while.
However, I eventually grew attached to the character and the idea of playing a cat, to a point where I decided to up my game, by reading up on anatomy, behavior, body language and other useful info, and started using this with detailed emotes, rather than “meow” my way around town.
That being said, there was still people who, at first glance, saw my character as a joke, because “Lol cat rp,” some of which would do… Well, rather nasty things like straight up kill it, although there were also many that thoroughly enjoyed my RP.
Moving on to the questionable item, I reached a point where I took RP rather seriously, and didn’t want to just scuff at, or ignore other people, even if they were rude like above, so I decided to add a feature to my cat / saber, which was an enchanted crystal in its forehead, that harbored fel / shadow magic. On death, the crystal would turn my char to stone, crumble and rebirth it as a newborn, that would mature over a few days, somewhat like a phoenix, effectively making my character immortal.
This was obviously more than a bit lorebreaking, but I think people found it interesting & non-intrusive enough to ignore the less RP friendly aspect, and simply saw it as a fun, little mystery gimmick.
Later down the line, I decided it was some sort of hyper enhanced soulstone, etched in place by some manic warlock that sought eternal life, but that was my headcanon, knowing no one would know IC.