Short answer — the Japanese chocolate/snack brands Malaysians commonly buy are Meiji, Glico (Pocky), Royce’, Lotte (Hello Panda / Koala’s March), Morinaga, and Japanese Kit Kat (special flavours). These appear frequently in Malaysian supermarkets, convenience stores, Japanese grocery corners (eg. Tokyo Street at Pavilion KL), and online marketplaces (Shopee, Lazada, Ubuy). (blog.easyparcel.com)

More detail (quick notes)

• Meiji — very common (milk bars, Apollo strawberry, macadamia chocolate, black/dark bars). Widely sold in supermarkets, convenience stores and online. (blog.easyparcel.com)
• Glico (Pocky, Pretz) — extremely popular biscuit‑stick chocolate snacks; long-established presence in Malaysia. (en.wikipedia.org)
• Royce’ — premium Japanese brand (nama chocolate) sold at higher‑end malls, specialty shops and some online sellers in Malaysia. (blog.easyparcel.com)
• Lotte — brands like Koala’s March and other chocolate biscuits are common in local retail and e‑commerce. (myweekendplan.asia)
• Morinaga — classic Japanese confectionery (Hello Panda, milk chocolates) found in supermarkets and online. (myweekendplan.asia)
• Kit Kat (Japan flavours) — while Kit Kat is a Nestlé/Nestlé Japan product, the Japan‑exclusive flavours and special editions are sought after and sold via importers, specialty stores and online marketplaces in Malaysia. (myweekendplan.asia)

Where to buy in Malaysia

• Large supermarkets and convenience stores (Giant, Tesco/Mydin, AEON, 7‑Eleven) — carry mainstream Meiji, Lotte, Morinaga and Pocky.
• Mall Japanese precincts / specialty stores (eg. Tokyo Street at Pavilion KL, Japanese grocery retailers) — carry premium and seasonal items like Royce’ and Japanese Kit Kat flavours. (tourism.gov.my)
• Online marketplaces and importers — Shopee, Lazada, Ubuy and specialty import shops stock both everyday Japanese chocolates and limited/seasonal flavours. (ubuy.com.my)

If you want, I can:

• give a short shopping list (exact products to look for), or
• check current availability/prices for a particular brand or flavour in Malaysia right now.