How to get over 100+ stats in game dev story

If you have a Hardware Engineer but cannot make a console by going to Develop > Console, you're not in the 3rd office. That option only becomes available once you enter the 3rd office. You will get the offer to go to the 3rd office around the 10-year mark for $25k, and it will be the final office you are offered.

They get decent stats when their jobs are all 5's and had some training. You missed out on Kairobot as well, you can hire him after you get several game of the year (GOTY) awards. Mister X is one of the earliest special characters you can hire, his energy bar is usually way above any other employee at that time (meaning he rarely leaves the office).