hiya jacblades, if your bowl is fairly small, but ur worried hes lonely, how abt neons, or other SMALL tetras, ones that dont get very big at all.
DO NOT put mollys, guppies, gouramis, platies, swordtails or any other brightly coloured fish in with him, he will go spare, and more than likely have his fins chewed! also, dont get a female betta to join him, as he will hound her, until she dies, or fights back and kills him.
if you wanted a tank mate to do some cleaning for your betta, how abt a small cory, or a sucking loach ? ive also heard that apple snails go well with bettas, providing there is enough room, as ive heard of sum1 on here whos snail clamped the betta between his shell and body, which wasnt nice, so its mainly down to size of his home, as to who can move in with him.
Hope this helps you out.
Keep us updated with who u decide to be ur bettas new tank mate!