prepaid train ticket that everyone has one or two in Tokyo(one is good enough, mine is Suica!)
The penguin one belongs to JR and the pink robot one belongs to other private lines including metro, but both can be used in either way to each other.
Most kiosks and restaurants in the train stations accept these cards for payment.
“MO” means “too, as well”, so on the card the pink robot has says “train service as well as buses, you can use pasmo”
“Suica” is the same sound of suika, a watermelon in itself. The theme colour is green, and the penguin is so adorable. And besides, “SUI” reminds us “swift”, and “ca” can mean “card” of course.
When they introduced this card system as the replacement of old paper ticket, we were very impressed how fast we could go through the ticket gate.