As I live in Japan, I can help you with this. Mitsubishi has an electric vehicle and also partners with Nissan to maintain the charging infrastructure. Here's a Wikipedia link to Mitsubishi's vehicle:
https://en.wikipedia.org/wiki/Mitsubishi_i-MiEV It's not as popular as the leaf, but I see a fair number of them around here.
Toyota and Mazda have made a joint venture for electric vehicles. They will be releasing their first vehicles in 2020. I'm not sure why they waited this long. I think the main reason for Toyota was that the Prius has been absolutely dominating the Japanese market for years, thanks in part to rebates from the government. I think it's the normal desire of a big company to avoid cannibalizing their successful sales. As for Mazda, they bet big on their turbine engine and I think they didn't have enough money to invest in R&D -- you will note that they never made a hybrid.
I have no idea what Honda is doing. At one point they claimed that all of their cars were going to have electric drive trains. However, they put all of their eggs in the hydrogen infrastructure that almost certainly isn't going to pan out. They have stopped production of the hybrid Insight in Japan, so I don't really know what their next move is. Apparently they have the Clarity (a plug in hybrid) which I've never seen in Japan. However, I would not discount them as, like I said, they've seen the electric writing on the wall for a long time.
I was just about to say that I would be surprised if Suzuki puts out an electric vehicle. The main office is literally down the street from my mother in laws place and I know lots of people who work there. However, I just did a google search and it appears that Suzuki has joined Toyota and Mazda in their joint venture and will release an EV in 2020 (however, reading between the lines, I think it might be a plugin hybrid aimed at continental Asian markets).
As for Daihatsu, they have made some concept EV cars. I've got an article from 2010 where they made an EV version of the Mira. Keep in mind that Daihatsu has been experimenting with EV for a long time. They did the EV1 in 1973! They also have a whole range of commercial "cars" (more like golf carts, really) that you frequently see on Japanese roads. Basically one-seaters used for delivering things. I don't actually expect them to enter into the market seriously for at least 5 years, though, because they don't make expensive cars. Although the prices have risen a bit recently, the main thing about Daihatsu has been that you can buy a decent car for ~$10K. It's just not feasible to build EVs at that price point without going the golf cart route, I think.
Subaru used to sell an EV in Japan. It didn't do very well and I've probably only seen it once or twice on the road. I think they are currently out of the market, but apparently have plans to re-enter in 2021.
I don't know anything about Isuzu (except that they make a shit ton of kei-tra - ubiquitous white light "pickup" truck - that every single farmer in Japan owns). Apparently they have an electric truck, but it is quite big -- for hauling containers, etc. For consumer vehicles, I think they are in the same boat as Daihatsu -- their bread an butter is dirt cheap trucks that just aren't going to be feasible in EV forms for a while.
One of the things that might surprise you is that I've never, ever seen a Tesla on the road in Japan. Probably they don't sell them here. Nor have I seen a Chevy volt. In fact I have not seen a single EV that isn't Japanese. If I didn't read HN, I would have the impression that Japanese manufacturers were the only companies making EVs. Of course, we know that's not true, but it's easy to get a strange perspective when you only experience things in one country.
Having said that, I'll be curious to see if Toyota's decision to wait before making an EV will pay off. I tend to think that Nissan and Mitsubishi (having had EVs on the road for 8 years now) will have an advantage. However, it occurs to me that Nissan and Mitsubishi can't have been making much (if any) profit on their EV program, while Toyota has been making buckets off of the Prius. Also, Toyota, Mazda and apparently Suzuki are pooling their resources, which will reduce their initial cost to market, so it might actually pay off. Only time will tell.
But this is just to say that Japanese manufacturers have not been sitting on their hands (with the possible exception of Honda -- I have no idea what they are doing).