To me, number 1 looks more like a Caladium than a Syngonium, but I am not sure. Number 2 is Calathea ornata. Number 3 is an Aglaonema, maybe Aglaonema 'Cory.' I don't recognize number 4.

That's what I think too. The brown leaf can't turn green again, plant would look better if you take that off, but glad you left it on for the pic to show what's going on. Looks like it has a toxic buildup of something in the soil, likely fluoride, to which this plant is very sensitive. Over time, some tap water can alter the PH of the soil also. Has it ever been repotted? The next time it's dry, I would flush the soil with a gallon of distilled (not bottled drinking water) or rain water if possible. Pour about 1/4 of the gallon on it, wait 15 minutes, pour another quart. Wait 15 minutes, then very slowly pour the last half gallon, all over the surface of the soil, not just in one spot. Then let it dry well before watering again. It likes very bright shade, but not much if any direct sun outside. In the house, some direct sun that's not during the middle of the day should be fine. Come on by the house plant forum if you have further questions or need instructions on repotting, best done during summer.

that's not a biting of anything. it's some kind of damage done to the leaf. It could have been folded or crushed at some point. maybe when it was repotted several leaves got crushed. So not problem there. the rest of the leaf is a good colour of green. Its not lacking sunlight for sure. Now if you placed it outdoors in direct sunlight it would have caused sunburns and damaged the plant. -- an error I made myself when I transplanted here in Canada. I came from the tropics where these plants are plentiful. These are under canopy plants and so they enjoy indirect sunlight -which is the reason they have such large leaves because that's needed for all the sunlight they can get. They are climbers too as they tent to grow up jungle trees to capture that sunlight. But they always stay within the shade. Yep, they can grow upwards of 20 feet. I've seen taller growths in the rainforest. However you do need to consider root space. if it's cramp then it can no longer sustain taller growths. you can always keep it short. Anyway.. you get the point. No direct sunlight. And lots of humidity.

Yes, they will fruit this year. They are really good value - I grew a few plants last year and have had my own grown dried Chillies all Winter from a few plants. They are way easier than tomatoes. I always grow mine from seed. These aren't Chillies, they're Hungarian Wax peppers from seed. As you can see by the Hoya in the background they are perfectly happy growing in my porch.